EM-SR--SRNS-HCAN-2018-0013 FINAL
Occurrence Report
After 2017 Redesign

H-Canyon


(Name of Facility)

Reprocessing


(Facility Function)

Savannah River Site Savannah River Nuclear Solutions


(Laboratory, Site, or Organization)

Name: Burns, R.
Telephone No.: (803) 208-8419


(Facility Manager/Designee)

Name: Abshire, Robert
Telephone No.: (803) 208-3026


(Originator/Transmitter)

Name: Abshire, R. Date: 01/03/2019


(Authorized Classifier (AC))

  1. Occurrence Report Number: EM-SR--SRNS-HCAN-2018-0013

      Contamination Found on First Level of 221-H-Canyon (U)

  2. Report Type and Date: FINAL

Date Time
Notification: 12/18/2018 10:09  (ETZ)
Initial Update: 12/18/2018 10:09  (ETZ)
Latest Update: 01/16/2019 10:57  (ETZ)
Final: 01/16/2019 10:57  (ETZ)

Report Level: L


  4. Division or Project: SRNS/M&O/NMD/HMD

  5. Secretarial Office: EM - Environmental Management

  6. System, Bldg., or Equipment: 221-H Canyon

  7. UCNI?: No

  Reviewed for Public Release:

  8. Plant Area: H-Area

9. Date and Time Discovered:     12/02/2018    12:15  (ETZ)

10. Date and Time Categorized:     12/03/2018    07:30  (ETZ)

11. DOE HQ OC Notification:

Date Time Person Notified Organization
NA NA NA NA

12. Other Notifications:

Date Time Person Notified Organization
12/03/2018 07:45  (ETZ) D. Sanders DFM
12/03/2018 08:06  (ETZ) DNFSB DNFSB
12/03/2018 08:00  (ETZ) T. Kohler FR
12/03/2018 07:50  (ETZ) C. Borders SRSOC
12/03/2018 08:01  (ETZ) J. Lott RCO FM
12/03/2018 08:05  (ETZ) T. Tice Eng Mgr
12/03/2018 07:30  (ETZ) J. Bodkin Ops Mgr

13. Subject or Title of Occurrence:

      Contamination Found on First Level of 221-H-Canyon (U)


14. Reporting Criteria:

6B(3) - Identification of onsite radioactive contamination greater than 10 times and no greater than 100 times the total contamination values in 10 CFR Part 835, Appendix D, exclusive of footnote 3 to Appendix D, and that is found outside of the following locations: areas routinely posted, controlled, and monitored for contamination; areas controlled in accordance with 10 CFR Section 835.1102(c); and, per 10 CFR Section 835.604(a), any non-posted area that is under the continual observation and control of an individual knowledgeable of and empowered to implement required access and exposure control measures. For tritium, the reporting threshold is 10 times the removable contamination values in 10 CFR Part 835, Appendix D.


15. Description of Occurrence:

On Sunday, December 2, 2018, the 221-H Canyon RPD FLM reported rainwater intrusion at 221-H -Canyon 1st level, section 5/6 expansion joint at a location where previous rainwater intrusions had occurred. Radiological Protection Department (RPD) performed surveys of the area and found 80,000 d/p/m beta-gamma contamination and no detectable alpha contamination. This radiation contamination level is greater than 10 times but no greater than 100 times the total contamination values in 10 CFR 835 Appendix D.


16. Is Subcontractor Involved? No


19. Immediate Actions Taken and Results:

The area where the contamination was found was reposted as a Contamination Area. The rainwater was removed and additional surveys were performed throughout the facility to identify other rainwater intrusion points. The area will continue to be monitored for additional leaks. No other radiological contamination was identified.

This occurrence was categorized on 12/03/18 at 0730 hours, which is longer than two (2) hours from discovery on 12/02/18 at 1215 hours. The delay in categorization was due to a change in interpretation for containment. This change has been communicated to applicable personnel.


20. ISM:

      5) Provide Feedback and Continuous Improvement


21. Cause Code(s):

A2B6C02 - Defective or failed material
A7B2C01 - Legacy contamination


22. Description of Cause:

Background:
The expansion joints between the sections of the building also run vertically from the roof to the first floor. Over time, some of these joints have failed and rain water migrates into the facility. Efforts have been made to stop the migration of rain water, but in certain locations its continues. This migration of rain water could also cause contamination to migrate to the clean parts of the building.

Cause:
The cause of this event was categorized using Causal Analysis Tree (CAT) as A2 Equipment / Material Problem / B6 Defective, Failed or Contaminated / C02 Defective or Failed Material and A7 Other Problem / B2 Radiological /Hazardous Material Problem / C01 Legacy Contamination. The rain water is migrating from the roof to the first floor through the expansion joint and picks up contamination that is then detected with the rain water in the clean area of the first floor. In this event RPD detected 80,000 d/p/m beta-gamma contamination and no detectable alpha contamination at the section 5/6 expansion joint on the first floor of 221-H -Canyon. This location has a history of previous rainwater intrusions.

Corrective Action (CA) #1 was to develop a plan for repairing the roof of 221-H Canyon to prevent intrusion of rain water.

The root cause of this occurrence was determined in accordance with the requirements of Manual 22Q Procedure CAP-1 "Corrective Action Program".


25. Corrective Actions
Local Tracking System Name: STAR - Site Tracking, Analysis and Reporting

        1.
Develop a plan for repairing the roof of 221-H Canyon to prevent intrusion of rain water.
Target Completion Date: 12/19/2019 Tracking ID: 2018-CTS-012615, CA #5


26. Lessons Learned:

This report reinforces the importance of monitoring known locations where rain water intrusions have occurred to identify the in leakage so mitigation steps can be initiated.

The H-Canyon Deputy Facility Manager, D. Sanders (803) 208-3341, has reviewed and signed a copy of this report and concurs with its contents.


27. Similar Occurrence Report Numbers:

None


30. HQ Keyword(s):

06B--Radiological - Facility/Equip/Site Contamination
11D--Other - Natural Phenomena
12M--EH Categories - Radiological Control (Other)
14L--Quality Assurance - No QA Deficiency


31. HQ Summary:

On December 2, 2018, the 221-H Canyon Radiological Protection Department First Line Manager reported rainwater intrusion at 221-H -Canyon first level, section 5/6 expansion joint at a location where previous rainwater intrusions had occurred. Radiological Protection Department performed surveys of the area and found 80,000 disintegrations per minute beta-gamma contamination and no detectable alpha contamination. This radiation contamination level is greater than 10 times but not greater than 100 times the total contamination values in 10 Code of Federal Regulations 835 Appendix D. The area where the contamination was found was reposted as a contamination area. The rainwater was removed, and additional surveys were performed throughout the facility to identify other rainwater intrusion points. The area will continue to be monitored for additional leaks. No other radiological contamination was identified.