ML20028C501
| ML20028C501 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/05/1983 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-01B, IEB-79-1B, RO-2-83-1-1P, NUDOCS 8301100280 | |
| Download: ML20028C501 (2) | |
Text
-.
l'ISIC:!ATD CEZIIILL l
--- sr CemIc cx=.any Poech Battant Atoutic Posser Station
~
R.D. 1, Delta, Pennsylvania 17314 Jaanary 5,1983 f
Mr. R. C. Emynee
{
)
ad=i=i=trator l
U.D. Baclear Bogulatory cr===i==ima l
"=5 = I
)
4 031 Park meenes i
Eing of Prussia, PA 19406
SUBJECT:
Egyneymarp nrrrramwamm. PEDOWT WCFFIFICATTON N4'imi== J. R. est =,==N's conversation with R. Bloogh, magion I, United States Maclear Regulatory h 4==ia= on 1/4/83.
l f
amferences Docket mm. 50-277/278 r
peach mottantIktits 2 a 3 0
T= chia =1 Specification 6.9.2(9) j mmported in mooordance with Isa Bulletin 79-013 Bogort No. 2-83-1/1F Occurrence Date 1/4/83 I
l l
Identification of Occurrences M1=r trical control switch of the type used for BOCS Soest coolmes
-[
failme diaring ashtal quaalificatica testing. The nylma j
t material used Sor the seritch cem surface because embrittled and i
cracked during radiation does of 27 mega rad. The stritch is li h ral Electric type CR 2940.
7 Conditices Prior to Occurrences
'~
tkait 2 operating at full posser.
Unit 3 operating at 964 daring and of cycle cometdown.
j Apparent Canoe of Occurrenos Eadiation ih embrit*1====t of the nylon ces surface anterial.
Analvale of Occurrence:
The seritch being tested d'ailma much that all contacts were agen.
This mode of fadlure could potentially cause the shutdoen of the EER system roca coolnes during the long term cooling (120 dere) pheme of a design basis IOCR.
Design h*=f=
Eoch radiatica Imsels were used for the test.
Imes of the EER mocus coolers is amoumed to result in j
i andamegamust failure of the 35R pump actors due to oven,tamating.
kb0 5
0 S
h
=
The Ehergency Service Water (ESH) design basic.Ls for one half cf the.inatalled cooleros each room cooler has o ra rad =at cooler, to be in operation.
Therefore, should the switches fail such that more coolers then moeded are operating, a loss of cooling could p.2tentially occur.
In addition, a previously reported electrical separations criteria design probleet requires one cooler to be ocatinuously operated in the NPCI Boom, B Core Spray Boom and B BMR knne-The races cooler design and switch procurement was by the AE Corp.
It is not believed to be a generic desigt probless and thus is
, Bechtel not reported under 10Crm part 21.
C..wi.iwe Actiosas l
A.
Imamediate with the above limits -=4%, the control switch contacts are $umeemed and 1meds lifted to asusure each room oooler will operate la the mode required to provide both short teme and long term accs system operatica.
c.
Icon seem l
Min==*ing is in pecogrees to provide switches which will meet the esswirosemental requirements.
ESN System analysis will be perfommed to determine the uctual 8Ystem oopshility.
Previous M-:-.==+:
2-41-40/27 s
E T.
s 4
f n
i i
li' I
n s
{l l
t II
'