ML20126B836
| ML20126B836 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/17/1980 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TASK-05-11.A, TASK-RR EAML-87, NUDOCS 8003200386 | |
| Download: ML20126B836 (2) | |
Text
s Jersey Central Power & Light Company
$N~ - (4" (')j r-
.r r-Madison Avenue at Punch Bowl Road 2'.
dt Morristown, New Jersey 07960 (201)455-8?00 March 17, 1980 LY1L-87
-Dirccccr uuc1ccr Ptactor Regulction Unitoa 5ttto: 1:ac1;cr Eegulatory Comission Jacairigton, D. C.
20555 D:c r u.
Suaject:
Cyst.cr Creer Nuc1ccr Gencreting Station Docr,c t !.o.50-21f Primary Coc1:nt Rntcm Pressurc icc1ction Velvc Your latu.r of Fecrusry 23, 1950 rocuests tact s.c rcvios tne systema at Oystcr Creen to determinc if tac ic110 wing "ovent V" isc1ction v:1vc configurations exict within the Cicss I ccun3 ry of the niga pressure piping conhacting primary coolant system piping to Ic., preccurc system piping:
(1) two enecx velves in series or (2) two ent.cn vc1vcs in scrits witn a motor op rcted vc1ve.
Essed on the review of the systems et Oyster Creek, it has been concluded th:t th velve configurctions at Dyster Crcek cre not es described in ycur letter.
7.ttsched for your information is e description of the vc1ve configuration of the Core Spray System ct Oystcr Creck.
If cdditional guestions exist or further c1crificction is nee 6cd ple:se fcc1 free to contset br. J. Knubel, Sui,ervisor, isuelect Safety & Licensing (201/455-C753), cf my staff or me.
1 Very truly yours, R). >
/
Ivan R. Finf ck, sr.
Vice Fresidtnt Eworn :.no subscriced to ocf ore me tnic /W/ G y of y'/.W. c/,1980.
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'.:','..;.. J.../.L:5 M37ARY F' 33 oF !.'IW JERSEY J
My Commiaio, Exp; ras Au;i. 16,1984 f
800s200
% q, Jersey Central Power & Light Company is a Member of the General Pubhc Utikties System
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CORE SPRAY SYSTEM VALVE CONFIGURATION l
The' following is a description of one of the two irdeperdent core spray loops fYom the primary coolant' system to the icw pressure piping interface. For ease of presentation, only one loop representing Core Spray System II will be
' described; however both loops are identical in valve configuration and associated instrmentation.
The first valve, located in.the drywell and c1csest to the Reactor vessel is a manual gate valve, V-20-23, nomally oriented in the locked open position. There are position indicating lights for this valve.in the control rocm. The valve is used for maintenance purposes.
Upstream of V-20-23 are two parallel isolation check valves, NZO2B and NZO2 D, which can be test operated to the open position frm switches in the control room.
Before opening the check valves, the test isolatien valve, V-20-18, is closed to provide two closed valves in series between the operating reactor and the low pressure portion of the core spray system. The actuator is not connected to the dise; and during test, the disc must be free to swing closed by gravity. Also, the actuator is equipped with limit switches so that the open and closed position of the exercisor acutator is irdicated along with the open and closed position of the disc itself.
Upstream of NZO2B and NZO2D are two parallel motor operated gate valves, V-20-21 and V-20-41, that are oriented in the normally closed position and can be opened frm switches in the control rom and by local keylock switches. They will open automatically en low-low reactor water level after the reaG,or pressure is less than about 285 psig.
These isolation valves are periodically tested. Before opening one of these valves, the test isolation valve is first closed to provide two closed valves in series between the operating reactor and the low-pressure portion of the core spray system.
Upstrean of V-20-21 and V-20-41 is a motor operated gate valve, V-20-18, that is normally in the locked cpen position.
This is known as the test isolation valve and is controlled from a switch in the control rom and by a local keylock switch. This valve is closed only during surveillance testing of other core spray system valves. There are geared limit switches for control and direct actuated switches for position indicating lights.
The valve is used during routine functional tests of the core-spray isolation valves.
The test valve is closed before test opening of the paralleled motor operated isolation valves cutside the dry well or the paralleled check valves inside the dry well. This provides two closed valves in series when testin3 the isolation valves with the reactor at pressure. There is a high-pressure alarm switch, PS-27-B, connected to the reactor side of this test valve; and if leakage _ throtgh the normal isolation valve is indicated, the test isolation valve can be closed to prevent relief valve flow.
The piping changes-fra ' stainless steel at reactor pressure to carbon steel at low pressure after the test isolation valve.
Upstream of V-20-18 is a relief valve, V-20-24, which protects the low-pressure portion of the core spray system.
It is installed between the core spray booster pmps and the isolation test valve, V-20-18.
The valve discharges to an open drain to permit checking for leakage.
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