ML20082F131
| ML20082F131 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/28/1983 |
| From: | Conn W BURNS & ROE CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-83-045-000 83-13, BRGO-RO-83-009, BRGO-RO-83-9, PT21-83-045-000, PT21-83-45, NUDOCS 8311280441 | |
| Download: ML20082F131 (3) | |
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. RECEWE0 I!!i
Burns and Roe,Inc.
b ~$ PR 12 as 601 Wdliams Blvd. a Richland, Washington 99352 a Tel. (509) 943-8200
Subject:
Work Order 3900-4000 gggygg yD_
Washington Public Power Supply System WNP-2
-RWCU System Leak Detection Responds to:
NA July 28, 1983 BRGO-RO-83-009 Response Required:
NA U.S. Nuclear Regulatory Commission
' Region V 1450 Maria Lane, Suite 210 Walnut Creek, California-94956 Attention:
Mr. J.B. Martin Gentlemen:
This letter is to report to you a condition we have deemed reportable under 10CFR21. This was discussed with R. Dodds of your staff on July 27, 1983.
The~ concern is that the environmental analysis performed as part of the
. Equipment Qualification Program identified the sections of the RWCU system piping with the highest probability of rupture routed through rooms where presently there is no existing capability for pipe leak detection. This condition results in no automatic mitigation of RWCU system leaks in these rooms (other than the system high flow indication which is not single failure proof) and no means of notif:dne the plant operators that there is an uncontrolled release of steam outside of primary containment. Complete details are contained in the attached evaluation.
If you have any questions, please contact W.G. Conn at (509) 943-8241.
Very truly yours, O
W.G. Conn Senior Group Supervisor WGC:MCD:lvs Attachments cc: BPA - Mr. W.S.. Chin, w/a SS - Mr. J.G. Tellefson, w/a SS - Mr. B.A. Holmberg, w/a SS - Mr. R.T. Johnson, w/a SS - Mr. L.T. Harrold, w/a SS - Mr. L.C. Floyd, w/a l
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t EVALUATION REPORT
.83-13 RWCU SYSTEM LEAK DETECTION 1.
Description.of Deficiency The environmental analysis performed as part of the Equipment Qualification Program identified the sections of RWCU-system piping, with the highest probability of rupture routed through rooms (R-313, R-408,-R-509 and R-511) where presently there-is no existing capability for pipe leak detection.. This condition results in no automatic mitigation of RWCU system leaks in these rooms (other than the'systen high flew indication which is not single failure proof) and no means of notifying the plant operators that there is an uncontrolled release of steam outside of primary containment.-
II..
Date and Time of Discovery AM - July 13, 1983
.III.
Safety Implication A pipe break in the RWCU system will not be automatically 1
i isolated and cannot be readily identified resulting in the potential for exceeding the offsite exposure guidelines of 10CFR100.
l IV.
-Cause of Deficiency Equipment Qualification, using information generated as part of.the-Pipe Break and Missile Study, identified rooms with RWCU lines and no break detection instrumentation. General Electric requires as part of the original Leak Detection System design, that all pipe routing areas be monitored by leak detection instrumentation. Probable cause for lack of l
leak detection temperature sensors for these rooms was re-
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liance on the system high flow isolation signal; It may have been assumed that-this signal is single failure proof as it is on all other similar system designs provided by General
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Electric.
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V.
Action to-Prevent Recurrence i
All areas specified by General Electric requiring leak detec-tion. sensors for system isolation will be reviewed to assure that each area is adequately monitored.
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- .sou EVALUATION REPORT 83-13 RWCU SYSTEM LEAK DETECTION.
VI.
Corrective Action Rooms R-509 and R-511 each have two temperature elements intended to provide leak detection capability for the RCIC lines routed through these rooms.
Since the RCIC steam condensing mode is being deactivated, these temperature elements will be used for RWCU. The two temperature ele-ments (RCIC Steam'Line Monitor) installed in room R-308 will be moved to room R-313 to permit detection of leak-age from the RWCU line routed through this room. Room R-408 has no existing leak detection capability and will require the installation of two. temperature elements over the RWCU line in that room. PED 218-E-B926 will be issued to make these modifications.
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