ML17272A854
| ML17272A854 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/04/1979 |
| From: | Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-79-24, NUDOCS 8003130516 | |
| Download: ML17272A854 (4) | |
Text
cdw 4M Washington Public Power Supply System A JOINT OPERATING AGENCY P. 0. aox 9ee 3000 QSO, WASHINCSON WAY RICHI.AND, WASHINCSON 99352 PHONC (509) 3V5 5000 Docket No.
50-397 Nucl ear Regs,qto~CqlNpg~.i.o~
Region V
1990 North California Blvd.
Suite 202, Walnut Creek Plaza Walnut Creek, California 94596 Attention:
Mr. R. H. Engelken, Director December 4, 1979
':;- G02-79-216 I
~
a 4
~ ~~~HA~>Ilgwu/P~g isa
~~c
.~ /kg OI 6
Subject:
,.WPPSS NUCLEAR PROJECT NO.
2 DOCKET NO. 50-397, CPPR-93 FREEZE PROTECTION OF SAFETY RELATED PROCESS, INSTRUMENTATION AND SAMPLING LINES
Reference:
NRC IE BULLETIN NO. '79-24
Dear Mr. Engelken:
- A The referenced bulletin requested construction permit holders review their plants to determine that adequate protective measures have been taken to assure safety related
- process, instrumentation and sampling lines do not freeze during extremely cold weather.
The following is in response to the Bulletin.
~ ~
All safety related
- process, instrument and sampling lines for WNP-2, with the exception of the Standby Service Water System are contained entirely within heated buildings.
Heating from existing heat sources will maintain building temperatures above freezing at the extreme cold weather condition of -27 F.
Portions of the Standby Service Water System piping, from the pumphouses to the ReactoI Building and other heated areas of the plant, are routed outside.
Most of this outside piping is buried well below the frost line.
Sections of the piping not buried are either drained when water is not flowing through them or are insulated and heat traced.
Heat tracing is by self limiting heater systems which adjust heat input to the piping based on the ambient temperature.
The heat tracing and insulation are adequate to prevent line freeze up at the extreme low temperature condition.
The insulation and heat tracing are guality Class I and supports and restraints are Seismic I.
8003130 5/4
'Ci I Ii l
RH Engelken Page 2
The sensing system for switching the Reactor Core Isolation Cooling (RCIC) and High Pressure Core Spray (HPCS) system lines from condensate storage tank to the suppression pool was originally located on the condensate storage tank.
This sensing system has been relocated to the Reactor Building and is no longer subject to freezing conditions.
In summary-;
a.l-l wKety relMed pmce~rrrtruntentztien'uz~mpling ""
lines are protected from freezing by:
1.
Locating the systems within adequately heated buildings.
2.
Burying, to well below the frost line, parts of the systems located outside heated buildings, and, 3.
Draining or providing insulation and heating tracing for those outside parts of the systems which cannot be buried to below the frost line.
Additio'nally, a procedure covering operating precautions to be taken during cold weather conditions will be prepared.
'ery, truly yours, DLR:HLB:cph cc:
JJ Yerder ber - B&R, N.Y.
RC Root - B8R, Site JG Davis - NRC, Wash DC ND Lewis - EFSEC, Olympia JR Lewis - BPA WNP-2 Files D. L.
RENBERGER Assistant Director Technology
4