ML18085B108
| ML18085B108 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 02/18/1981 |
| From: | Schneider F Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8104010756 | |
| Download: ML18085B108 (6) | |
Text
Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 201/430-7373 Production Mr. Boyce Grier, Director Office of Inspection and Enforcemen U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Grier:
NRC IE BULLETIN 80-06 February 18, 1981 ENGINEERED SAFETY FEATURE (ESF) RESET SUPPLEMENTAL RESPONSE UNIT NOS. 1 AND 2 -
SALEM GENERATING STATION We hereby submit, as a supplemental response, information requested by your Mr. P. Bender for use by the NRC consultant *evaluating our response to the subject Bulletin.
If you have any further questions, we will be pleased to discuss them with you.
Sincerely, CC Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Q 110401075,
STATE OF NEW JERSEY
)
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SS:
COUNTY OF ESSEX COUNTY OF ESSEX
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FREDERICK w. SCHNEIDER, being duly sworn according to law deposes and says:
I am a Vice President of Public Service Electric and Gas Company, and as such, I signed the letter dated February 18, 1981, to Mr. Boyce H. Grier, Director, NRC Office of Inspection and Enforce-ment, Region I, as a supplemental response to NRC Bulletin No. 80-06 "Engineered Safety Feature Reset Controls."
The matters set forth in said response letter are true to the best of my knowledge, information and belief.
Subscribed and sworn to before me
- r/~-.._
this )0* *
- day of I 1981
//
Notary Public of New Jersey FREDERICKW:CHNifDER
'~Y Cornmissi~:m expires on {lei. / /l/J(3
--..............__...,._..._....._..,__~~~~
SALEM 1 AND 2 DESIGN CHANGES RESULTING FROM BULLETIN 80-06 The circuit changes made to certain valves in the Salem stations are described below:
- 1. Main Steam Warmup Isolation Valves {MS18) - Unit #2 The original design of the Unit #2 MS18 valves incorporated a modulating feature which is operated from the main control console.
If the operator had selected a "valve open" condition prior to an isolation signal, the valve would close, but would have reopened upon reset of.the isolation signal due to the modulating control.
The circuit h~s been redesigned so that the occurrence of an isolation signal removes the permissive conditions for valve modulation until the operator repeats a "valve open" control action. Sketch #1 illustrates the change in a simplified fashion.
- 2.
Fire Protection Isolation Valve (FP147) - Units 1 and 2 The original design of the. fire protection isolation valves (FP147) used an alternate action pushbutton for valve opening and closing~ This type of pushbutton is analagous to a maintained contact switch.
If the valve had been open prior to the isolation signal, it would have closed.but would have reopened upon reset of the isolation signal.
The valve control circuit has been modified by replacing the alternate action pushbutton with two separate pushbuttons.
Sketch #2 is a simplified control schematic which il-lustrates the change.
- 3.
Safety Injection Isolation Valve (SJ53) - Units 1 and 2 The original design of the safe~y injection test-line isolation valves (SJ53) incorporated a latch-in relay which provided a seal-in open signal to the isolation valve.
An isolation signal would result in valve closure, but reset of that signal would have caused the valve to reopen if it had been signalled to open prior to the isolation signal.
The control circuit has b~en modified to replace the seal-in feature with two separate relays, and to add an auxiliary relay which breaks any "valve open" command upon occurrence of an isolation signal. Sketch #3 is a simplified control schematic which illustrates the changes.
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