ML20235F452

Application for Proposed Amend 162 to License DPR-54, Changing Tech Specs Re Concentration of Oxygen in Waste Gas Holdup Sys to Provide for When Sys Free of Potentially Explosive Gases,As for Example,During Maint.Fee Paid

ML20235F452
Person / Time
Site:	Rancho Seco
Issue date:	09/21/1987
From:	Andognini G SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F Office of Nuclear Reactor Regulation
Shared Package
ML20235F454	List: ML20235F452 ML20235F464
References
GCA-87-079, GCA-87-79, NUDOCS 8709290129
Download: ML20235F452 (3)

Text

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gSMUDSACRAMENTO MUNICIPAL UTILITY DISTRICT O P. O. Box 15830, Sacramento CA 95852-1830 (916) 452-3211 i AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA l l

SEP 21 1987 GCA 87-079 Frank J. Miraglia, Jr. N c (

Associate Director for Projects 9 cn l U. S. Nuclear Regulatory Commission ro j@  ;

Philips Building o i 7920 Norfolk Avenue Bethesda, MD 20014 3> 9d l cn  % -

Docket No. 50-312 -1 Rancho Seco Nuclear Generating Station Unit # 1 l License No. DPR-54 PROPOSED AMEN 0HENT No. 162

Dear Mr. Miraglia:

In accordance with 10 CFR 50.90, the Sacramento Municipal Utility District proposes to amend its Operating License DPR-54 for Rancho Seco, and herewith submits Proposed Amendment No. 162 for this purpose.

Presently, the technical specifications require that the concentration of oxygen in the Haste Gas Holdup System be limited te not more than four percent by volume. This limitation ensures that the concentration of potentially explosive gas mixtures contained in the Haste Gas Holdup System is below the flammability limits of hydrogen and oxygen. However, the existing specifications do not provide for when the Haste Gas Holdup System is free of potentially explosive gases, as for example, when the system is isolated and open to the atmosphere for maintenance. (This is a condition during which the oxygen concentration is much greater than four percent, but the hydrogen concentration is much less than four percent.) The revised pages of the Rancho Seco Technical Specifications presented as Attachment I provide for such conditions.

Details of Proposed Amendment No. 162 are presented in this submittal as the Description, Reasons for Change, and Evaluation and Basis for Safety Findings as Attachment II, and No Significant Hazards Consideration as Attachment III.

Pursuant to 10 CFR 50.91(b)(1), the Radiological Health Branch of the California State Department of Health Services has been informed of this proposed amendment by mailed copy of this submittal. g 8709290129 070921 '1 PDR ADOCK 05000312 P PDR gg [/SD Oo RANCHO SECO NUCLEAR GENERATING STATloN O 1444o Twin Cities Road, Herald, CA 95638-9799;(209) 333-2935

e GCA 87-079 F.J. Miraglia Enclosed is a check in the amount of $150.00, as required by 10 CFR 170.21, " Schedule of Fees."

The District intends to implement this proposed amendment immediately after the NRC's approval and issuance.

If there are any questions concerning this report, please contact Mr. Ron H. Colombo at (916) 452-3211, extension 4236.

l Sincerely,

[p.CarlAndognini r Chief Executive Officer, Nuclear Sworn to and subscribed before me this M Y day of September, 1987.

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(_,) @otaryPu6lic Attachment JUDY E. LUNA E

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cc w/atch:

G. Kalman, NRC, Bethesda (2)

A. D'Angelo, NRC, Rancho Seco J. B. Martin (2)

MIPC (2)

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GCA 87-079 F.J. Miraglia bc w/atch:

X General Manager MS 41 Chief Executive Officer, Nuclear MS 209 (2)*

X X Executive Assistant MS 209 AGM, Nucl. Tech. & Adm. Services MS 206 AGM, Nuclear Power Production MS 254 Director, Nuclear Quality MS 271 Director, Nuclear Tech. Services MS 206A Director, Nuclear Ops. & Maint. MS 257 Director, Plant Support MS 258 Director, Sys. Rev. & Test Prgm. MS 259

' Modifications Manager MS 201 X Manager, Nuclear Training MS 296

_ _ _ _ . Manager,, Nuclear Licensing MS 286 L Manager, Nuclear Engineering MS 208-6 Manager,' Cost Control Services MS 270 Public Information MS 204 Manager Maintenance MS 254 Plant Support Eng.. Manager MS 208-6 Manager Operations MS 255 Manager, Env. Protection MS 292A Manager, Rad. Protection MS 244 Nuclear Chemistry Manager MS 250 Risk Manager (D. Nears) MS 40 MSRC Secretary (T. Ferrando) MS 274 X Surveillance Coordinator MS 278 IIRG HS 298 X NAC (4) MS 209 X T. Baxter (Esq.)

X F. Burke (B&H)

X Fourth Floor Files MS 43 LER Files MS 298 X Licensing Files MS 286 PRC Files MS 286 X RIC Files MS 224 Special Report Files MS 286 X Tech. Spec. Files

• 1 w/atch + 1 w/o atch