ML20055C058

Proposed Tech Spec Tables 3.3-9 & 4.3-6,deleting Pressurizer Relief Tank Level Instrumentation.Justification Encl

ML20055C058
Person / Time
Site:	Sequoyah
Issue date:	08/02/1982
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20055C055	List: ML20055C054 ML20055C058
References
NUDOCS 8208100082
Download: ML20055C058 (6)

Text

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3. Reactor Coolant Temperature - llot teg R

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5 ENCLOSURE 2 JUSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATIONS FOR SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 The pressurizer relief tank (PRT) level transmitter which feeds the backup control room (BCR) level indicator is inoperable. This level indication is required by Technical Specification 3 3.3 5. The required technical specification action for the inoperable instrumentation is to restore the channel to operable status within ? days or be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. Repairing the level transmitter requires entrance into lower containment, which cannot be made now with the reactor at power.

Therefore, a technical specification change is being requested to delete PRT level from tables 3 3-9 and 4 3-6.

Segaufah Nucles? Plant was designed for emergency shutdown from outside the control room. Included in the design for the emergency shutdown of the reactor is instrumentation for monitoring the integrity of the PRT. The BCR PRT level indication is one of the instruments used in the verification of PRT integrity. However, we have verified by review of emergency operating instructions (E0I-7) required for chutdown outside the control room, that no operator reliance, action, or decision is based on PRT level indication.

PRT integrity can be challenged by a stuck open pressurizer power operated relief valve (PORV) or safety valve. We have adequate instrumentation to verify an impending or actual challenge to the PRT without PRT level indication. Any impending PRT challenge can be detected by pressurizer level and pressure, both of which are available in the BCR.

An actual challenge to the PRT from a stuck open PORV can be detected from the BCR handswitches which have green (closed) and red (open) lights for direct indication of PORV position. - Further, the PORV block valves have remote handswitches on the switchgear with green (closed) and red (open) lights for block valve position indication. Therefore, we can determine if a PORV is stuck open and we can verify subsequent block valve closure outside the main control room. An actual challenge to the PRT from a stuck open safety valve can be detected from the PRT pressure indication in the BCR.

In conclusion, the BCR PRT level indication is not needed to evaluate or verify PRT integrity as explained above and can be deleted.

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