U-600221, Forwards Rev a to Clow Corp Rept 6-18-85, Purge & Vent Valve Operability Qualification Analysis, Per 850715 Commitment & SER Confirmatory Issue 69ii.Valves Meet Criteria of NUREG-0800 & TMI Action Plan Item II.E.4.2
| ML20134F392 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/19/1985 |
| From: | Spangenberg F ILLINOIS POWER CO. |
| To: | Butler W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20134F395 | List: |
| References | |
| RTR-NUREG-0800, RTR-NUREG-800, TASK-2.E.4.2, TASK-TM U-600221, NUDOCS 8508210089 | |
| Download: ML20134F392 (2) | |
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U-600221 L30-85(08-19)-L 1A.120 ILLINO/S POWER 00MPANY
' l10' CLINTON PCWER STATICN. P.o. BCX 678. CLINTON. ILLIN0is 61727 August 19, 1985 Docket No. 50-461 g O, q (p /
Dir-ector of Nuclear Reactor Regulation g
Attn:
Mr. W. R. Butler, Chief Licensing Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Clinton Power Station Containment Continuous Purge Isolation Valve Operability Qualification Analysis (SER Confirmatory Issue #6911)
Dear Mr. Butler:
Illinois Power (IP) letter U-600173, dated July 15, 1985, committed to provide the NRC Staff with a detailed analysis of the Clinton Power Station (CPS) Containment Vent & Purge valves supplied by CLOW Corp-oration (i.e., the 12 inch Tricentric butterfly isolation valves used in the CPS Containment Continuous Purge System). The attached CLOW Corp-oration report, entitled " Purge and Vent Valve Operability Qualification Analysis", fulfills this commitment.
The CLOW report describes the design of the Tricentric butterfly valve and the Bettis pneumatic actuator used to operate the valve.
In addition, descriptions of various tests performed to determine flow and torque characteristics and application of this test data to the installed conditions of the four subject isolation valves are presented.
Information as to the structural integrity of the valve componente and operator assembly under combined seismic and Design Basis Loss of Coolant Accident (LOCA) loadings is also presented. To substantiate previous model tests and show the validity of the computer model used in these calculations, CLOW performed an aerodynamic choked flow operational test of a full-size 12" valve (same size used at CPS) at Vought Corporation in November 1981. This test demonstrated that the valve would operate under the choked flow test conditions, that mass flows were as predicted, and that use of the CLOW computer model to predict torques was a conservative method (peak measured torque was yE approximately 657. of that predicted). This test also incorporated a 8-static 11.0g seismic load to the actuator (nearly three times the CPS seismic acceleration requirement).
GJ Valve Bench Tests, with the valve operating under normal service pgg conditions, show the opening time for the 12" CLOW Tricentric model used 55 at CPS is about 5 seconds and the closing time is about 4 seconds. For g4 a LOCA condition, the torques for the subject valves are positive m
(closing) torques for all disc positions. This indicates the valves will be fully operable in both the open and closed directions under ac o.W worst-case conditions.
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U-600221 L30 85(08-19)-L 1A.120 Based upon these tests and detailed analyses, IP believes these Vent & Purge valves fully meet the NRC valve operability criteria contained within NUREG-0800, Branch Technical Position CSB 6-4.
As such, the qualification program fulfills the applicable requirements of TMI Action Plan Item II.E.4.2(6) regarding provisions for containment isolation valve operability. The information contained herein should be sufficient for the Staff to close CPS Safety Evaluation Report Confirmatory Issue #69(11).
If you should have any questions on this matter, please contact me.
Sincere
- ours, F. A Spa nber Dir tor Nucl r Licensing and Configuration Nuclear Station Engineering TLR/ lab Attachment cc:
B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Regional Administrator, Region III, USNRC Illinois Department of Nuclear Safety t