ML18030A254

Amends Response to NUREG-0737 Item II.E.4.2 Re Containment Isolation Dependability.Util Has Initiated Design Change to Prevent Automatic Opening of Valves That Open on Isolation Signal Reset

ML18030A254
Person / Time
Site:	Susquehanna
Issue date:	04/14/1981
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.4.2, TASK-TM PLA-715, NUDOCS 8104170381
Download: ML18030A254 (2)

Text

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ACCESSIO.'3 NBR: 8104170381 DOC ~ rlATE: Rl/04/14 l'lOTARIZED: HO DOCKET FACIL:50-367 Susauehanna Steam Electr ic Station) Unit 1) Pennsylva 050 0387 50 388 Susauehanna Steam Electric Station) Unit 2) Pennsylva AUTH ~ MA,'nE 'UTHOR AFF IL I AT IO"3 Light CURT IS) <<.4'ennsylvania AFFILIATIn.<< Power 4 Co ~

PEC I P ~ VA~lE- RECIPIENT YOUNGBLOOD)R.J. Licensina Branch 1 SUBJECT! Amends resoonse to iwUREC)-0737 Item ICE.4.2 re containment isolation deoendaoiiity.Util has initiated oesion chanae to orevent automatic ooenino of valves that ooen on isolation sianai reset.

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TWO NORTH NINTH STREET, AI.LENTOWN, PA. 18101 PHONE~ (2 I 5) 770-5151 n

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NORMAN W. CURTIS vice president-Engineering rt construction-Nuclear 770 5381 April 1$ , 1981 iMr. B. J. Youngblood, Chief ~xX Y q>

<o, Licensing Branch No. 1 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 SUSQUEHfQUA STEAM ELECTRIC STATION CLARIFICATION TO RESPONSE ON CONTAINMENT ISOLATION ER 100450 FILE 841-12 PLA-715

Dear iver. Youngblood:

The purpose of this letter is to amend our response to NUREG 0737 item II.E.4.2 (containment isolation dependability). Part 4,of this requirement states that no containment isolation valves should automatically open upon isolation signal reset. The response was sent by a letter from N. W. Curtis on March 16, 1981 (PLA-659). This response states that all except a few valves do not auto-matically open on isolation signal reset. Justification is provided for those valves that do open.

We have completed an audit which has identified additional valves that open on isolation signal reset. We have initiated a design change to prevent the automatic opening of these valves.

The first paragraph of the response to part 4 of item II.E.4.2 should be modified as follows:

(4) All containment isolation valves, except those listed below, will not automatically open on logic reset. Some valves other than those listed below require corrective action to comply with this requirement. All such actions will be completed prior to fuel load. An overide of any isolation signal will not cause automatic opening of any isolation valve.

Very truly yours,

/7 Cd. ~v~~/

N. W. Curtis

$q o Vice President-Engineering 6 Construction-Nuclear DPM/mks PENNSYLVANIA POWER 8 LIGHT COMPANY 8>O.C Z VO3~(