ML20080M659
| ML20080M659 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 09/29/1983 |
| From: | Conn W BURNS & ROE CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-83-021-000, REF-PT21-S 83-15, BRGO-RO-83-013, BRGO-RO-83-13, PT21-83-021-000, PT21-83-21, NUDOCS 8310040232 | |
| Download: ML20080M659 (2) | |
Text
s Burns and Roe,Inc.
601 Williams Bhd a Richland, Weshington 99352 m Tel. (509) 9434200
Subject:
Work Order 3900-4000 Washington Public Power Supply-System WNP-2 Room Pressurization Due To High Energy Line Break Responds to:
NA 8
September 29, 1983 BRGO-RO-83-013 Response Required:
NA Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention: Director
Dear Sir:
This letter is to report to you a condition we have deemed potentially reportable under 10CFR21. This subject was discussed with R. Dodds of your Region V on September 28, 1983. We are unable to determine repor-tability pending further engineering study.
The concern is that plant modifications _. implemented for fire protection and other concerns included blocking of some vent paths from Reactor Building Rooms containing high energy lines. Room pressurization calculations were not updated to reflect the revised venting capability.
Decreased vent area results in higher room pressure following a High Energy Line Break (HELB) which could cause wall / floor failure with attendant damage to related components. Complete details are contained in the attached preliminary evaluation.
If you have further questions, please contact W.G. Conn at (509) 943-8241.
Very truly yours.
WGC:MCD:lvs Attachment W.G. Conn cc: BPA - Mr. W.S. Chin Senior Group Supervisor SS - Mr. B.A. Holmberg, w/a
.SS - Mr. L.T. Harrold, w/a SS - Mr.'J.G. Tellefson, w/a SS - Mr. R.T. Johnson, w/a NRC >- Mr. J.B. Martin, w/a Region V saioo oaa2 s3o929 3
PDR ADOCK 05000397
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ROOM PRESSURIZATION DUE TO HIGH ENERGY LINE BREAKS #83-15 i
DESCRIPTION OF DEFICIENCY Plant modifications implemented for fire protection and other concerns included blocking of some vent paths from Reactor.
Building Rooms containing high energy lit:as. Room pressurization calculations were not updated to reflect the revised venting capability.
SAFETY IMPLICATION
- Decreased vent area results in higher room pressure following a High Energy Line Break (HELB) which could cause wall / floor fai-lure with attendant damage to safety related components.
4 CAUSE OF DEFICIENCY Failure to recognize that reducing room vent paths could have adverse safety implications.
ACTIONS TO PREVENT RECURRENCE a.
Group Supervisors will be advised that changes to room vent areas require consideration as to potential effect on room presurization calculations.
CORRECTIVE ACTION All Reactor Building Rooms containing high energy lines were evaluated as to vent area changes.
Six rooms were determined to require reanalysis. This activity is currently in process.
Resulting room pressures will be evaluated to determine effect on T
walls / floors.
f m m
.