ML20116E834

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Advises That Addl Tech Specs Unnecessary for Mechanical Stops in Containment Purge & Vent Valves.Design Features & Requirements in FSAR Will Adequately Assure That Valve Stops Will Not Be Removed
ML20116E834
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 04/26/1985
From: Zimmerman S
CAROLINA POWER & LIGHT CO.
To: Vassallo D
Office of Nuclear Reactor Regulation
References
NLS-85-100, NUDOCS 8504300450
Download: ML20116E834 (4)


Text

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.4 Carolina Power & Light Company SERIAL: NLS-85-100 APR 2 61985 s

Director of Nuclear Reactor Regulation Attention: Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS.1 AND 2 DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 CONTAINMENT PURGE AND VENT VALVES

Dear Mr. Vassallo:

The SER regarding containment purge and vent valves issued September 18, 1984, requested Carolina Power & Light Company (CP&L) to submit a request for Technical ,

3pecification (TS) revisions to reflect the limitation of the opening angle for the 18,20, '

and 24 inch purge and vent valves for the Brunswick Steam Electric Plant. Following CP&L's response dated December 21,1984, you issued a letter dated March 25,1985 and reiterated the request to submit TSs or provide our basis for not doing so.

Carolina Power & Light Company has carefully reviewed your request and our response, and does not believe further TSs than already exist on these valves are required. As stated in our December letter, the mechanical stops installed on these valves to prevent opening beyond a 50 degree limit are permanently installed cylindrical steel s: ops (see Figure 1). As such, there is no need for adjustment nor is it credible that the:e stops may fall off. Considering the significant effort now underway, both by the nuclear utility industry and the NRC staff to eliminate unnecessary TSs, and the fact that the present TSs conform very closely with the standard TSs for this plant, it is inconsi:, tent to request TSs requiring periodic verification that these stops are installed. Since these mechanical stops become a design feature of the valves, including a requirement for the '

stops, and the bases for having them, in the FSAR will more than adequately assure that they will not be inadvertently removed in the future. This change to the FSAR will be included in the next annual update, presently scheduled for submittal in July 1985.

Enclosure t is a draft of the proposed wording for this change.

8504300450 850426 PDR ADOCK 05000324 P PDR lOY I

411 Fayetteville street

  • P. O. Bon 1551
  • Raie gh. N C 27602

Mr. D. B Vassallo P;ga 2 For the above reasons, CP&L does not intend to submit a license amendment request regarding these valves. Please forward questions regarding this matter to Mr. R. 3.

Fasnacht at (919) 836-7318.

Yours very truly, S. merman Manager Nuclear Licensing Section JSD/crs (13163SD)

Enclosure ,

cc: Mr. L. W. Garner (NRC-BNP)

Dr. 3. Nelson Grace (NRC-RII)

Mr. M. Grotenhuis (NRC) t I

L_ . _ - _ - _ _ _ - - - _ - _ _ - _ _ _ _ _ _ - - _ _ _ _ - _ _ _ - _ - _ _ _ _ _ _ - _ _ _ _ _ _ _ _ . _ _

ENCLOSURE 1 FSAR Paragraph 6.2.4a (Cont'd)

The containment isolation valves used in the Containment Atmosphere Control System

'(see Section 6.2.5) are analyzed to operate against the calculated maximum pressure, 49 psig. The CAC primary containment isolation valves of 18,20, and 24 inch are mechanically limited to a maximum opening of 50 degrees. This opening limitation has been imposed to reduce valve and actuator stresses caused by dynamic LOCA and seismic loading (Reference 6.2.4-2).

REFERENCES SECTION 6.2 (Cont'd) 6.2.4-2 Posi-Seal International, Inc. - Report No. 32525SL-001,

Subject:

LOCA and Seismic Analysis for Containment Purge and. Vent Valves dated February 15, 1984.

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