ML19093B034

in Response to Request of 12/15/1977, Enclosed Completed Questionnaires on Standby Diesel Generators

ML19093B034
Person / Time
Site:	Surry
Issue date:	04/14/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Case E Office of Nuclear Reactor Regulation
References
Serial No. 614A/121577
Download: ML19093B034 (2)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIRGINIA 23261 April :14, 1973:

• Mr. Edson G. Case, Acting Director Serial No~ .614A/121577 Office of Nuclear Reactor Regulation PO&M/DLB:das U. S. Nuclear Regulatory Commission Docket Nos. 50-280 Washington, D. C. 20555 50-281 License Nos. DPR-32 DPR-37

Dear Sir:

In response to your request of December 15, 1977, completed questionnaires on Standby Diesel Generators were forwarded in our letter of January 23, 1978.

Two completed questionnaires *were forwarded; one for Surry Unit Nos. 1 and 2 and one for North Anna Unit No. 1. In the questionnaire for Surry Unit Nos. 1 and 2, seven items were not filled in due to unavailability of data. The missing information has been obtained and is included in the attachment to this letter.

Attachment

QUESTIONNAIRE FOR NUCLEAR REGULATORY co~~IISSION Attachment RELIABILITY STUDY OF STANDBY.DIESEL GENERATOR UNITS SURRY POWER STATION UNIT NOS. 1 AND 2 The following information was not available at the time of our January 23, 1978 submittal. Item numbers used are from the original questionnaire.

Item B.2 (p2): "Minimum air tank pressure for cranking: 90 psig Item B.2 (p3): "What is air pressure drop from air tank to engine during cranking?" ~ psi Item B.2 (p4): "What is the time required to recharge one air tank?"

~ minutes from 50 psig to 210 psig.

NOTE: Where questionnaire: refers to air "tank" we have interpreted this to mean "bank". Each engine has two independent "banks" consisting of three "tanks" ..

Item D. 4a (p 7). : "Normal operating (ofl) pressure: ..zl_psi.

Item L.3.a (pl4): "Equilibrium (lube oil pressure): 75 psi.

Item 0.3.a.b (pl7): " ... maximum speed surge when starting;" 965. rpm.

NOTE: Frequency meter is not functional on starting and tachometer is not normally observed during start. The figure reported is the result of observation of one start.

Item Q. 5 (pl8): Inside switch gear hottest (Temperature): 85°F ~vith ambient temperature 72.

NOTE: Switchgear, voltage regulator and exciter are in the same cabinet.