ML18136A298
| ML18136A298 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/13/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 891-102379, NUDOCS 7912180182 | |
| Download: ML18136A298 (3) | |
Text
.I i I VIRGINIA. ELECTRJC A.ND POWER COMPANY
);lICHMONU,VIEGIN.IA 23261 December 13, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. A. Schwencer, Chief Serial No. 891/102379 Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
PO/FHT:baw Docket Nos:
License Nos:
Subject:
Surry Power Station Units 1 and 2 Containment Purging and Venting During Normal Operations 50-280 50-281 DPR-32 DPR-37 In response to your letter of October 23, 1979, on the above subject, Virginia Electric and Power Company provides the following commitment to comply with your "Interim Position for Containment Purge and Vent Valve Operation Pending Resolution of Isolation Valve Operability".
- 1.
As previously reported, current Technical Specifications require that containment vacuum be maintained for plant conditions where reactor coolant temperature exceeds 350°F.
Page 3.8-2 of the Surry Technical Specifications states that "The Reactor Coolant System temperature and pressure being below 350°F and 450 psig, respectively, ensures that no significant amount of flashing steam will be formed and hence that there would be no significant pressure buildup in the containment if there is a loss of coolant accident".
An analysis has been initiated to determine the actual pressure attained inside containment in the event of a DBA-LOCA at 350°F and 450 psig.
The purge valves will then be demonstrated operable under the calculated accident flow condition loading.
- 2.
In the interim, until the analysis can be completed, administrative controls will be established to prohibit use of the purge valves above 200°F except for the short term operation of the valves necessary to break the vacuum in the containment or establish vacuum during startup.
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VIRGINIA ELECTRIC AND POWER COMPANY TO Mr. Harold R. Denton 2
- 3.
The above commitment to prohibit purging above 200°F will ensure that containment integrity is maintained in the event of a DBA-LOCA for all plant conditions, and is in compliance with your Interim Position.
cc:
Mr. James P. O'Reilly Region II Very truly yours,
- z/?,)2/) ~e~U/1/j C. M. Stallings Vice President-Power Supply and Production Operations
COMMONWEALTH OF VIRGINIA CITY OF RICHMOND
)
) s. s.
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Before me, a Notary Public, in and for the City and Common-wealth aforesaid, today personally appeared C. M. Stallings, who being duly sworn, made oath and said (1) that he is Vice President-Power Supply and Production Operations, of the Virginia Electric and Power Company, (2) that he is duly authorized to execute and file the fore-going commitment in behalf of that Company, and (3) that the statements in the commitment are true to the best of his knowledge and belief.
Given under my hand and notarial seal this /3th day of 124 c..-evnher
, J.2Z:L
- My Commission expires ~_..J-a_,~,1~1='<<:i.~~.5J....,,,Y~-~~'*'""-?~*~~)~?~"#""-'-}~
(SEAL)