ML18031A217
| ML18031A217 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 08/08/1979 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| PLA-389, NUDOCS 7908140430 | |
| Download: ML18031A217 (3) | |
Text
A CURTISgN ~ w ~
REC IP ~ NAME GRIERr B,H ~
SUBJECT:
Amends 790628r790522 8, 790323 l tr s on def fciency r ept re cir cle seal solenoid valves w/defective diodes
~ Determined not reportable, DISTRIBUTION CODE!
8019S COPIES RECEIVED:LTR l ENCI
~
SIZE:
TITLE CONSTRUCTION DEFICIENCY REPORT
( 1 OCFR50
~ 55E)
~
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS')
ACCESSION NOR:7908140430 DOC ~ DATE: 79/08/08 NOTARIZED:
NO DOCKET rr FACIL'squehanna Steam Electr'ic Statfonr Unit ir Pennsyiva 05000387 50 38$
usauehanna Steam Electric Statfonr Unit 2g Pennsylva 05000388 AUTHOR AFFILIATION Pennsyl vanf a power 8 Light Co ~
RECIPIENT AFFILIATION Region lr Phfladelphfai Office of the Director RECIPIENT COPIES REC IP IENT COPIES ID CODE/NAME LTTR ENCL IO CODE/NAME LTTR EN L
ACTION:
I4 PM Wi/r/EQ 1
20 LA RB 1
15 BC L,cd/I~'Z 1
21 AD Cmg 1
INTERNAL! 0 G
0 H6.
08 MPA 10 GAB 12 JORDAN'/IE 16 AD FOR ENGR 17 AD REAC SFTY 22 DIR DPM AD/SITE TECH GEOSC IENCES RR MECH ENG BR STRUCT ENG BR EXTERNAL: 03 LPOR 24 ACRS 1
?
1 1
1 1
1 1
1 1
1 1
1 16 1
02 NRC pDR 07 EDO Ir STAFF 09 OEPY OIR DPM 11 STANOROS OEV 13F IELD COOR/IE 17 AD PLANT SYS 19 AO SYS/PROJ 23 DELO DIRECTOR OSE MATL ENG BR S
HANAUER 04 NSIC 4' lg)g 5~
o TOT4L NUMRER OF CO~IES REQUlRED:
I TTR ~.
ENCL I
TWO NORTH NINTH STREET, ALLENTOWN, PA.
18101 PHONE:
(215) 821-5151 NORMAN W. CURTIS Vice President Engineering IL CdnStruCtidn 821-538t August 8, 1979 Mr. Boyce H. Grier Director, Region Z
U.
S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 17406 SUSQUEHANNA STEAM ELECTRIC STATION UPDATE OF STATUS CIRCLE SEAL SOLENOID VALVES WITH DEFECTIVE DIODES ERs 100450/100508 FILE 840-4 PLA-389 Dear Mr. Griers This supplements and amends PPGL's position as presented in PLA-376, dated June 28, 1979; PLA-361r dated May 22, 1979; and PLA-336r dated March 23, 1979.
The referenced correspondence identified a deficiency which was considered to be reportable under the provisions of 10 CFR 50.55(e).
- However, PPGL has analyzed'echtel MCAR-1-31 which documented the deficiency and Bechtel's final evaluation of the Circle Seal valves and their impact on safety and, based upon the rationale and analysis of safety implications, concludes that the condition is not reportable under the provisions of 10 CFR 50.55(e).
We arrive at this conclusion because the present approved Susquehanna design does not provide for the use of Circle Seal Pilot Solenoid Valves in any location where the failure of the subject diodes on these valves could have caused or led to the disablement of a safety system necessary for safe operation or shut down of the plant.
PPEL and Bechtel shared a concern regarding the possibility that future system designs or modifications could have inadvertently resulted in the utilization of the suspect. Circle Seal solenoid valves which were being held in inventory.
Therefore, PPEIL directed Bechtel to return all such valves, both Q and non-Q, to Circle Seal for replacement of the existing diodes with a higher quality diode manufactured by Semtech Corporation.
PENNSYLVANIA POWER IL LIGHT COMPANY Vgos>egrtS ~
Mr. Boyce H. Grier August 8, 1979 We review this action as conservative, with the expressed intent of avoiding any possibility of introducing valves with inadequate diodes into safety systems.
Very truly yours,
'AA N.
W. Curtis Vice President-Engineering a Construction ARS:mcb cc:
Mr. Victor Stello (15)
Director-Office of Znspection
& Enforcement U.
S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. McDonald, Director (1)
Office of Management Znformation 6 Program Control U. S. Nuclear Regulatory Commission Washington>
D.C.
20555 Mr. Robert M. Gallo, Reactor Znspector U. S. Nuclear Regulatory Commission P.
O. Box 52 Shickshinny, Pennsylvania 18655