ML20117Q030

Forwards SER Accepting Licensee Request for Proposed Amend to Tech Specs Re Exemption of Sensor Portion of Thermocouple from Core Exit Thermocouple Calibr Requirement

ML20117Q030
Person / Time
Site:	Calvert Cliffs
Issue date:	05/11/1990
From:	Newberry S Office of Nuclear Reactor Regulation
To:	Capra R Office of Nuclear Reactor Regulation
Shared Package
ML20116D885	List: ML20116D909 ML20116D938 ML20116D955 ML20116D996 ML20116E022 ML20116E030 ML20116E054 ML20116E116 ML20116E188 ML20116E217 ML20116E250 ML20116E468 ML20116E482 ML20116E510 ML20116E531 ML20116E556 ML20116E581 ML20116E602 ML20116E630 ML20116E658 ML20116E700 ML20116E718 ML20116E733 ML20116E793 ML20116E819 ML20116E870 ML20116F010 ML20116F242 ML20116F258 ML20117P719 ML20117P732 ML20117P766 ML20117P770 ML20117P773 ML20117P775 ML20117P777 ML20117P784 ML20117P786 ML20117P789 ML20117P802 ML20117P803 ML20117P820 ML20117P823 ML20117P824 ML20117P828 ML20117P831 ML20117P854 ML20117P857 ML20117P860 ML20117P861 ... further results
References
FOIA-96-237 TAC-54524, TAC-54525, NUDOCS 9005150124
Download: ML20117Q030 (2)

Text

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I UNITED STATES l

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fa NUCLEAR REGULATORY COMMISSION i

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WASHINGTON, D. C. 20555 l

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MAY 1 1 1990~

j DOCKET N0. 50-317, 50-318 l

l MEMORANDUM FOR:

Robert A. Capra, Director Project Directorate I-1 Division of Reactor Projects - I/II FROM:

Scott Newberry, Chief Instrumentation and Control Systems Branch Division of Systems Technology

SUBJECT:

CALVERT CLIFFS NUCLEAR POWER PLANT, UNITS 1 & 2 i

REQUEST FOR AMENDMENT TO TECHNICAL SPECIFICATIONS (TAC Nos.

54524 & 54525)

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REFERENCE:

Letter from J. A. Tiernan (BG&E) to NRC Document Control Desk, dated June 16,1988, "Calvert Cliffs Nuclear Power i

Plant Unit Nos. 1 & 2; Docket Nos. 50-317 & 50-318, 'equest for Amendment."

The purpose of this memorandum is to forward the enclosed (Enclosure 1) Safety Evaluation Report associated with the proposed amendment to the Calvert Cliffs Nuclear Power Plant Units 1 & 2 Technical Specifications (TS) for Core Exit Thermocouples(CETs). The proposed amendments are requested by the licensee, Baltimore Gas and Electric Company (BG&E) in the above reference.

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The licensee requests exemption of the sensor portion of the thermocouple from the CET calibration requirement.

Instead, the thermocouple sensors would be i

calibrated only prior to installation into the reactor core. Thelicegsee's justification is that the estimated maximum instrumentation drift (10F ) will not be detrimental to the intended purpose of the CETs during post accident monitoring,sincethepurposeoftheCETsinpost-accidentmonitoring)isto indicate the radial distribution of the coolant enthalpy (temperature across each quadra-t of the core instead of the actual temperatures. To verify operability, temperatures indicated by the CETs will be compared to temperature t

indications of hot leg RTDs (the RTD sensors will be calibrated each refueling outage). The staff finds this method of in situ calibration acceptable in this specific case.

The licensee requests a TS change that states, if the number of operable CET channels is less than the minimum operable channels requirements in TS

Contact:

MikeWaterman,(SICB: DST) 492-0785 i

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