GO2-92-032, Responds to Licensee Ltr Re Performance of Acoustic Monitors Used on Facility for Safety Relief Valve Position Indication
| ML17289A310 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 02/04/1992 |
| From: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| G2-92-32, GO2-92-032, GO2-92-32, TAC-M82168, NUDOCS 9202100186 | |
| Download: ML17289A310 (4) | |
Text
ACCELERATED DISTRIBUTION DEMON TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9202100186 DOC.DATE: 92/02/04 NOTARIZED:
NO FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe AUTH.NAME AUTHOR AFFILIATION SORENSEN,G.C.
Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000397
SUBJECT:
Responds to licens'ee ltr re performance of acoustic monitors used on facility for safety relief valve position indication.
DISTRIBUTION CODE:
AOOID COPIES RECEIVED:LTR L ENCL 0 SIZE:
TITLE: OR Submittal:
General Distribution NOTES:
D RECIPIENT ID CODE/NAME PD5 LA ENG,P.L.
INTERNAL: ACRS NRR/DET/ESGB NRR/DST 8E2 NRR/DST/SICB8H7 NUDOCS-ABSTRACT OGC/HDS1 RES/DSIR/EIB EXTERNAL: NRC PDR COPIES LTTR ENCL RECIPIENT ID CODE/NAME PD5 PD NRR/DET/ECMB 7D NRR/DOEA/OTSB11 NRR/DST/SELB 7E NRR/DST/SRXB 8E OCJ~~F-B G.FREE"
~6'I NSIC COPIES LTTR ENCL 1
D D
R D
NOTE TO ALL"RIDS" RECIPIENTS:
D D
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 24 ENCL fYi+
~ 'I
,I
,I
~ ' f I
'I I
J
~ II "
r,
WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 96B
~ 3000 George Washington Way
~ Richland, Washington 99352 February 4, 1992 G02-92-032 Docket No. 50-397 9202100186 920204 PDR ADOCK 05000397 P
PDR U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555 Gentlemen:
Subject:
NUCLEAR PLANT NO. 2, OPERATING LICENSE NPF-21 ACOUSTIC MONITORS FOR SAFETY RELIEF VALVE POSITION INDICATION (TAC NO. H82168)
References:
1.
"Repeated Failures of Safety Relief Valve Acoustic Monitors (TAC No. H82168) 2.
- Letter, G02-90-038, GC Sorensen (SS) to
- NRC, "Request for Amendment to Technical Specification 3.4.2 (Safety Relief Valves) and Table 3.3.7.5-1 and 4.3.7.5-1 (Accident Monitoring Instrumentation)
Under Emergency Circumstances",
dated March 2, 1990 This letter responds to Reference 1 regarding the performance of the acoustic monitors used on WNP-2 for safety relief valve (SRV) position indication.
In the 1992 Refueling and Maintenance outage the Supply Systems plans to install safety grade direct position indication on all of the safety relief valves.
The sensors will be linear voltage differential transformers (LVDT) that will detect the stem position of the SRVs.
Individual "open-closed" position indication derived from the LVDTs will be available on panel P851 (Board S) (see FSAR Figure 13.5-2).
In addition, a single LVDT detecting an open SRV will result in an "SRV OPEN" annunciation on front panel, P601.
By February 28, 1992 the Supply System will submit a request for a change to WNP-2 Technical Specifications 3.3.7.5 and 3.4.2 that will allow for either an acoustic monitor or LVDT position indication to provide the position indication currently required of the acoustic monitor.
ij~>ge+Two ACOUSTIC MONITORS FOR SAFETY RELIEF VALVE POSITION INDICATION (TAC NO. M82168)
In Reference 2 we discussed a potential design change that would involve moving the acoustic monitor charge amplifiers outside the primary containment thereby providing accessibility to the amplifiers during power operation.
The vendor has a concern that the longer cable lengths will degrade the performance of the acoustic monitors.
Before the change can be fully implemented, a few amplifiers would need to be relocated to establish if any degradation in the performance of the amplifiers during power operation is justified by the greater accessibility achieved.
With the decision to add the LVDT direct position indication, we have decided to defer an evaluation of this change.
Very truly yours, pc.
G.
C. Sorensen, Manager Regulatory Programs AGH/bk cc:
JB Martin -
NRC RV NS Reynolds
- Winston 8 Strawn PL Eng -
NRC DL Williams - BPA/399 NRC Site Inspector
- 901A