GO2-83-660, Advises That BWR Owners Group Option 2 Will Be Implemented Per SER (NUREG-0892) Outstanding Issue 1.7(9), Mods to Automatic Depressurization Sys Logic. Reliance on RCIC Sys as HPCS Backup for Selected Accidents Eliminated
| ML17277A689 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/26/1983 |
| From: | Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0892, RTR-NUREG-892 GO2-83-660, TAC-59820, NUDOCS 8308030390 | |
| Download: ML17277A689 (6) | |
Text
REGULATORY 10lRNATION OISTRIBUTION SYS' (RIBS)
ACCESSION NBR;8308030390 DOC ~ DATE: 83/07/26 NOTARIZED:
NO DOCKET ¹ FACIL:50-397 WPPSS Nuclear Projecti Unit 2~ Washington Public Powe 05000397
'UTH,NAtlE AUTHOR AFFILIATION SORENSEN~GGC, Washington Public Power Supply 'System RECIP,NAME RECIPIENT AFFILIATION SCHKENCERgA ~
Licensing Branch 2
SUBJECT:
Advises that BWR Owers Group Option 2 will be implemented per SKR (NUREG 0892) outstanding Issue.1,7(9)g "Mods,to Automatic Oepressurization Sys Logic ~
" Reliance on RCIC hays as HPCS'ackup for selected accidents elirsinated, DISTRIBUTION CODE:
B001S COPIES RECEIVED'LTR, ENCL SIZEI,
-.TITLE:'Licensing 'Submittal:
PSAR/FSAR Amdts 8 Related Cerrespondehce NOTES:
INTiERNALs I >>EXTERNALS RECIPIENT IO CODE/NAME NRtYl/DL/ADL NRR LB?
LA KLD/HDS2 IE/OEPER/EPB 36 IE/DEQA/QAB 21 NRR/DE/CEB 11 NRR/DE/EQB 1'3 NRR/DE/MEB 18 ERR/OE/SAB 24 NRR/OHFS/HFEBPO NRR/OHFS/PSRB NRR/DSI/AEB 26 ERR/OSI/CPB 10 NRR/DS I/ICSB 16 NRR/DS I/PSB 19 NRR/DSI/RSB 23 RGN5 ACRS OM&/DSS (AMDTS)
LPbR 0$
NSXC 05 COPIES LTTR ENC 1
1 3
1 1
1 2
2 1
1 1
1 1
1 1
1 1
1 1
1 6
1 RECIPIENT L,ID CODE/NAME NRR LB2 BC AULUCKgR~
01 IE F ILE IE/DEPER/IRB 35 NRR/DE/AEAB NRR/DE/EHEB NRR/DE/GB 28 NRR/DE/MTEB 17 NRR/DE/SGEB 25 NRR/DHFS/LQB 32 NRR/DL/SSPB NRR/DS I/AS8 NRR/DSI/CSB 09 NRR/DSI/METB 12 N
RAB 2?
EG 0<
/MIB BNL (AMDTS ONlY)
'2 NTIS COPIES LTTR ENCL
'1 1
1 1
1 1
?
1 1
1 1
1 1
1 1
-1 1
- 1 1
1
>TOTAL NUMBER OF COPIES REQUI'RED:
LTTR 53 ENCL
ul 5 V> Ii 4>>,>>'
"'ll 4
~ fr(
,X fl',
lI )"
Mil>>1 f, fr 4
rll f >>.>>
~
f>>>>M,I'3 f 4'w itff
>>qrfg M
1 I 44 ) 4
~ J,>>>> 4',
4 Jfrlw f f 9< r,,>>M 4
>> f "
I f f >>)
4<< 'f 4'll gP f "t-rv
'c>>
Of f, w
I f
.f' I
">>r>> '>>
- ~'I 4
-I 'a'f f fr I >>>>
~
4 4,
~,if 4 '.)
>>MY
'4 I
R f
'trit f I I I '
a,,rffgr
'i,Z j
R II R
r>I ~
"Ir 'M>>t<<r lI gX >I
<<4 fl l
444 4 >X>>f>>f, tt
'4 344>>. X.frit 1'Nr I "'IXR>>'4t,r<<>'I>>'4>>
"~hl,, fht> 44 M frf~ f,, fqggf r j il>~-4,
'<<MAX It
~
<<'4<<'-
4 )
.1
'M I
l f
I R
n N
I" f f J
't MIN II' t
4 Wgjl[>> l NNW
,I,'IWP MI t
NI 4
p If','4 4 /l) ),,
<'C trt f I,III I
<<'tl fl
(>>Ir 4 "
4 W,
h Q
~
Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 July 26, 1983 G02-83-660 Docket No. 50-397 Director of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Schwencer:
Subject:
NUCLEAR PROJECT NO. 2 SAFETY EVALUATION REPORT, NUREG-0892, OUTSTANDING ISSUE 1.7(9),
MODIFICATIONS TO ADS SYSTEM LOGIC
Reference:
- Letter, GD Bouchey (SS) to A. Schwencer (NRC),
"Safety Evaluation Report, NUREG-0892, Outstanding Issue 1.7(9), Modifications to ADS System Logic",
dated May 4, 1983 In the reference letter, the Supply System committed to implementation of a NRC mandated change to the existing ADS System Logic.
This change would pre-clude the need for operator initiation of ADS during certain selected accidents which do not result in high primary containment pressures.
The Supply System has evaluated the proposed options for the change and con-cluded that it will implement BWROG Option 2 (elimination of the high drywell pressure trip portion of the existing logic, plus addition of a manual inhibit switch).
The implementation schedule for incorpor ating this modification has not been determined pending completion of design details.
As a result of this change, the ADS will become fully automatic and, in conjunc-tion with the existing low pressure ECCS systems, will provide backup redun-dancy for the HPCS under all high pressure, level decreasing events.
- Thus, the reliance on the RCIC System as a
HPCS backup for certain selected accidents is eliminated.
For this reason, the RCIC System will no longer be maintained in the WNP-2 Equipment gualification Program.
This will simplify future procurement of spare parts and limit the documentation requirements for the system throughout the life of the plant.
In addition, this change will allow the selection of replacement equipment from a broader spectrum of vendors and increase the poten-tial for incorporation of improved component designs.
gyo 830726 PDR ADOCK PDR 830803O3 050003~7
/,
l
,h h
lh k
hh
Mr. A. Schwencer Page Two July 26, 1983 G02-83-660 Further details describing the changes to ADS will be provided, along with the implementation
- schedule, as the change process progresses.
Very truly yours, G.
C. Sorensen Acting Manager, Nuclear Safety and Regulatory Programs RLW:lp
r
~~~.~.
k v,r ~ ~
~
~
%l E'