ML20214J746
| ML20214J746 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 08/01/1986 |
| From: | Holmberg B WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| GO1-86-0112, GO1-86-112, NUDOCS 8608150157 | |
| Download: ML20214J746 (3) | |
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Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashingtonWay Richtand, Washington 99352 (509)372-5000 August 1, 1986 G01-86-Oll2 Docket Nwber 50-460 Mr. John B. Martin Regional k!ministrator, P,egion V U.S. Nuclear Regulatory Ccmnission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596
Subject:
NUCLEAR PROJECT NO. 1 REPORTABLE CONDITION 10CFR50.55Ce) (POTENTIAL)
GSB FLOODING
Reference:
- 1) Telecon, C.R. Edwards, Supply System to W. Ang, Region V, Nuclear Regulatory Ccnmission Dated July 2, 1986 In Reference 1), the Supply System informed your office of a potentially reportable deficiency under 10CFR50.55Ce).
Attachment 'A' to this letter, provides the Supply Systems's interim report on the subject condition. Because our Investigation is continuing we are unable at this time to provide a final report. It has been determined that only Quality Class I pipe spools and conduits have been identified as affected by the flooding. The Quality Class I equipment installed on elevated pedestals in the area was unaffected.
We plan to follow up the attached Interim report with a final report no later than January 2, 1987. If you have any questions or desire further information, please advise.
B. A. Holnherg WNP-1 Program Director BAH /TED/11w Attachnent cc: E.C. Haren, UESC 895 M N0Y'E NRC Document Control Desk, Wash. D.C.
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8 ATTACENENT A Docket No. 50-460 Reportable Condition 10CFR50.55Ce) (Potential)
Flooding of the General Services Building Interim Report BACKGROUND Early on the morning of July 2,1986 water leaked from the temporary construction Fire Protection System. The permanent plant Fire Protection System was not ccrnplete prior to the time of construction shutdown.
The flooding initially started in stairwell no. 13 of the General Service Building (GSB) at floor elevation 479 ft. A 6" Victaulic coupling on the vertical standpipe of the temporary construction Fire Protection System allowed joint separation end an estimated 340,000 gallons of water was discharged.
An InterTnittent fire pump signal at the Security Gate 1-1 was brought to the attention of the Supply System employee responsible for the plant Fire Protection System when he reported to work at 6:30 A.M. Water to the Fire Protection System was secured to terminate further flooding prior to 7 A.M.
An examination of the lower elevation areas of the GSB at 7 A.M. revealed that the flooding was contained within portions of the 395 ft. floor elevation between colunn lines F to W and 4 to 10, and the maxinun water level Initially appeared to be approximately 3' 1".
DESCRIPTION OF POTENTIAL DEFICIENCY During the flooding, nunerous items, such as pipe spools, valves, punps, motors were submerged in water. The initial concern at the time of flooding was the effect of the water chemistry on the submerged items, and what specific items were affected.
SAFETY IMPLICATIONS The concern was whether a halogen problem existed which could cause Intergranular stress corrosion cracking at some future date on the stainless steel components.
CORRECTIVE ACTIONS PLAtNED Water samples were taken frcxn three difforent flood locations on July 2,1986 and three strnples were taken from sunps on July 3, 1986. A test for water pH was made at five (5) different locations on July 2, 1986, and all showed a pH of 7.
Halogen swipe surveys were performed on sixteen (16) randcmly selected stainless steel !tems (pipe spools, a tank and a filter). The surveys were completed on July 11, 1986.
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CORRECTIVE ACTION PLAfNED (Con't)
Subriequent testing of the water samples and the swipe tests disclosed a halogen level lower than established Project criteria; therefore, halogen contamination is not a concern at this time.
Walkdowns of the flooded area have been performed by Supply System and UESC personnel, for the purpose of identifying the specific equipment affected by the flood. These walkdowns have confinned that the only Quality Class I (safety related) Items involved in the flood are partially fabricated pipe spools, pipe fittings and empty conduits. A IIsting of the items affected is In the process of being compiled and wl11 be included as part of the nonconformance report (s) which are yet to be written.
The following is a stmnary of the actions completed to date and actions planned to be completed:
e Remove water from affected area. Complete 7/3/86 e Perform Halogen Swipe Survey and obtain results for swipe survey and water sanples - Conplete 7/11/86 o Identify specific Quality Class I items that were flooded - in process e Write nonconformance reports and process - not complete o Check tightness of Victaulic coupilngs in the General Service Building and Containment - in process.
As of the date of this report, actions have not been completed to correct this potentially reportable condition. A final report will be issued no later than January 2, 1987.
ACTIONS TO PREVENT RECURRENCE To date, final determination has not been made as to the action which will be taken to prevent recurrence. This information will also be included in our January 2, 1987 report.