ML20063M110

Ro:On 820811,RHR Containment Suction Valve RHR-861A Found Opening Only Halfway & Promptly Declared Inoperable. Requests Extended 48-h Maint on Valve.Valve Not Completely Disassembled & Total Scope of Repair Not Established

ML20063M110
Person / Time
Site:	Robinson
Issue date:	08/31/1982
From:	Starkey R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RSEP-82-1399, NUDOCS 8209100136
Download: ML20063M110 (2)

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- At y se 4a Carolina Power & Light Company H. B. ROBINSON STEAM ELECTRIC PLANT g .

POST OFFICE BOX 790 ..

HARTSVILLE, SOUTH CAROLINA 29550 m AUG131982 Robinson File No: 13510H Serial: RSEP/82-1399 -

Mr. James P. O'Reilly Regional Administrator U. S. Nuclear Regula tory Commission Region II na 3 101 Marietta Street, N. W., Suite 3100 co -4 C Atlanta, Georgia 30303 Q Q zn H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT No. 2 DOCKET NO. 50-261 y'm,0 LICENSE NO. DPR-23 REQUEST EUR EXTENDED MAINTENANCE ..

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Dear Mr. O'Reilly:

f.4 p$g2' Carolina Power and Light Company (CP&L) hereby requests extended maintenance, for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, on the Residual Heat Removal (RHR) containment suction valve RHR-861A. His request is made pursuant to Technical Specification ('IS) 3.3.7.

• On Augus t 11, 1982 a t approximately 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br />, while performing PT-2.8B, RHR-861 A was noted to be opening only half way. RHR-861A was promptly declared inoperable. The plant wa s in a hot , zero power condition when the valve was declared inoperable. Subsequently a reactor trip placed the plant in hot shutdown at 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />. The plant entered a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Limiting Condition for Operation (LCO) per TS 3.3.1.3, based on one RHR recircula tion flow path being inoperable at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br />. Investiga tion into the cause of failure indicates that the valve disk may be deformed sufficiently to prevent full opening of the valve. The repair of this valve could potentially require more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and, therefore, CP&L j requests an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> before the plant would be required to i proceed to cold shutdown. This request is based on the fact that there is essentially no decay heat in the core, since the unit has not yet

! returned to power operation af ter the current six-month refueling outage, and an additional thermal cycle on the plant does not appear warranted.

Therefore, the plant can remain in the hot shutdown condition without affecting the public health and safety. In addition, if the plant were i to go to cold shutdown this would require operation of the RHR system, l one loop of which is inoperable due to isola ting RHR-861 A.

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Letter to Mr. James P. O'Reilly Serial: RSEP/82-1399 Page 2 Carolina Power and Light believes that the current plant condition of hot shutdown is a very safe condition for the plant given the failure of RIIR-861 A a nd , the refo re , the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> extended maintenance being requested is in the best interest of the public health and safety. It should be noted tha t, a t this time, the valve has not been completely disassembled, and the total scope of repair has not been established. Therefore, if it

, is necessary to extend this request beyond the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, you will be promptly notified.

If you have any questions, please contact my staff.

Very truly yours,

(( Rs A R. B. Starkey, r.

General Manager

11. B. Robinson SEG Plant FMG/bs cc: G. Requa (NRR)

S. P. Weise l

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