ML20151S997
| ML20151S997 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/20/1988 |
| From: | Mroczka E, Sears C NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM A06120, A6120, TAC-44594, NUDOCS 8804280547 | |
| Download: ML20151S997 (2) | |
Text
.i MEAST UTILITIES o.ner.i orrice. seio.n stre i. seriin, connecticut fs
^
April 20, 1988 Docket No. 50-336 eM170 Re: TMI Action Item II.D.1 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:
Millstone Nuclear Power Station, Unit No. 2 Relief Valve and Safety Valve Testina (Tac No. 44594)
In a letter dated September 30, 1986(I) the NRC Staff requested that Northeast Nuclear Energy Company (NNECO) provide additional information regarding NUREG-0737, Item II.D.1, the testing of pressurizer power operated relief valves (gd safety valves at Hillstone Unit No. 2.
By letter dated June 30, 1987 NNEC0 responded to all but three questions fromgeference (1), Questions 9, 10 and 12.
By letter dated August 19, 1987 NHEC0 provided to the NRC Staff the responses to these three questions and also provided additional information in response to Question 2.
NNECO also committed to submit the results of testing of the P0RV block valve operators completed during the re:ent refueling outage within two (2) months after start-up.
In a letter dated March 1, 1988(4), the NRC Staff issued a Safety Evaluation on the acceptability of NNEC0's fulfillment of the requirert.ents of TMI Action (1)
D. H. Jaffe letter to J. F. Opeka, "Request for Additional Information on Relief Valve and Safety Valve Testing," dated September 30, 1986.
(2)
E. J. Mroczka letter to U.S. Nuclear Regulatory Commission, "Millstone Nuclear Power Station, Unit No.
2, Reliof Valve and Safety Valve Testing," dated June 30, 1987.
(3)
E. J. Mroczka letter to U.S. Nuclear Regulatory Commission, "Millstone Nuclear Power Station, Unit No. 2, Relief Valve and Safety Valve Testing" dated August 19, 1987.
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(4)
D. H. Jaffe letter to E. J. Mroczka, "Millstone Unit No. 2, THI Action Item II.D.1 (Relief Valve and Safety Valve Testing) - Tac No. 44594,"
dated March 1, 1988.
8804280547 880420 PDR ADOCK 05000336 p
DCD I
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l U.S. Nuclear Regulatory Commission A06120/Page 2 April 20, 1988 Item II.D.1.
The Staff indicated that the conclusions were predicated upon successful completion of the block valve test program.
In accordance with that commitment of Reference (3) and to close out the TMI Action Iten issue, NNEC0 submits the following information on the PORV block valves:
o Hillstone Unit No. 2 has tested the PORV block valve operators as requested in Reference (1).
The PORV block valve operators were tested using the M0 VATS test equipment.
The valves were tested and set for a differential pressure of 3643 psi for closing the valves and 4838 psi for opening the valves.
These differential pressures are well above the differential presseres the PORV block valves would experience.
o PORV block valve RC-403 has been set at 7020 pounds thrust (74.22 foot-pounds) in the close direction and 3560 pounds thrust (37.64 foot-pounds) in the open direction.
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PORY block valve RC-405 has been set at 7237 pounds thrust (76.5 foot-pounds) in the close direction and 4360 pounds thrust (46.1 foot-pounds) in the open direction, o
The maximum thrust / torque of the PORV block valve operators is 7300 pounds thrust (77.38 foot-pounds).
lherefore, the settings for the operators are below the maximum allowable thrust / torque at torque switch trip.
We trust that this information is satisfactory.
Please contact us if you have any questions.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY
.b. N eem E. J. Mroczka Senior Vice President L
VL By:
C. F. Sears Vice President cc:
W. T. Russell, Region 1 Administrator D. H. Jaffe, NRC Project Manager, Millstone Unit No. 2 W. J. Raymond, Senior Resident Inspector, Millstone Unit Nos. 1, 2 and 3 P. Habighorst, Resident Inspector, Millstone Unit No. 2 1
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