ML20195K404

Proposed Tech Specs Consisting of Tech Spec Change 88-14, Changing Table 3.3-12 to Clarify Essential Raw Cooling Water Min Channels Operable Column

ML20195K404
Person / Time
Site:	Sequoyah
Issue date:	12/02/1988
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20195K399	List: ML20195K396 ML20195K404
References
NUDOCS 8812050203
Download: ML20195K404 (7)

Text

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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 l DOCKET NOS. 50-327'AND 50-328 (TVA-SQN-TS-88-14) 5 i

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$ RADI0 ACTIVE LIQUID EFFLUENT MONITORING INSTRUMENTATION x

E MINIMUM O CHANNELS INSTRUMENT w OPERABLE ACTION 1.

GROSS RADI0 ACTIVITY MONITORS PROVIDING AUTOMATIC TERMINATION OF RELEASE -

a. Liquid Radwaste Effluent Line 1 30

b. Steam Generator Blowdown Ef fluent Line 1 31

c. Condensate Demineralizer Effluent Line 1 30

$ 2.

CROSS RADI0 ACTIVITY MONITORS NOT PROVIDING AUTOMATIC TERMINATION OF RELEASE Essential Raw Cooling Water Effluent 14ea Er k h o

a. eine- 1 32 l

b. Turbine Building Sump Effluent Line 1 32

3. FLOW RATE MEASUREMENT DEVICES 3

a. Liquid Radwaste Effluent Line 4

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Steam Generator Blowdown Effluent Line II o

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d. Cocling Tower Blowndown Effluent Line

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-ENCLOSURE 2 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327'AND 50-32S (IVA-SQN-TS-88-14 )

DESCRIPTION AND JUSTIFICATION FOR '

CIARIFICATION TO TABLE 3.3-12 4

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Description of Change '

r Tennessee Valley Authority proposes to modify the Sequoyah Nuclear Plant  !

(SQN) Units 1 and 2 Technical Specifications to revise Table 3.3-12, l "Radioactive Liquid Effluent Monitoring Instrumentation." This change will clearly state the minimum radiation monitor channels required operable for each header for essential raw cooling water (ERCW) effluent.

Reason for Change TVA is requesting this char.ge to avoid future misinterpretation of '

limiting condition for operation (LCO) 3.3.3.9, table 3.3-12, the minimt.m radiation monitor channels required opecable for the ERCW effluent headers. On June 5, 1988, noncompliance of technical specifications resulted from an incorrect interpretation of the minimum radiation monitor

. channels required for the EPCW effluent line as stated in licensee event j report 327/88-002. Table 3.3-12 lists the instrument as ERCW effluent f

line and gives the minimum radiation nonitor channels required operable as

, one. Because there are "A" and "B" trains of ERCW, each with two t

radiation monitors for each discharge header, one monitor for each train must be operable.

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Justification for Change

The ERCW system is described in the Final Safety Analysis Report (FSAR),

i section 9.2.2. The system is designed to supply cooling water to various components within both the primary and secondary sections of each unit, j Sufficient redundancy of piping and ccmponents is provided to ensure that

! cooling water is maintained to vital loads at all times. The ERCW

effluent line consists of an A train and a B train discharge header on l

which radiation monitors 0-RM-90-133 and 0-RM-90-140 (A train) and 0-RM-90-134 and 0-RM-90-141 (B train) are located. 10 CFR 50, General

! Design Criterion (CDC) 64, requires that all ef fluent discharge paths be monitored for radioactive releases under normal operations. Also, i Regulatory Guide (RG) 1.21 states that continuous monitoring should be j provided for liquid effluent releases. Section 11.4.2.1.2 of the FSAR

states that continuous monitoring is done with the above-mentioned devices 4

to prevent the release of radioactive materials into the environment.

} SQN's design, with each header having separate sources of possible

! radioactive releases, is in compliance with CDC 64 and RG 1.21. These I

radiation detectors seeve as accident monitors to detect leakage from '

! . either the component cooling or containment spray heat exchangers. The l proposed change will clearly distinguish the A and B train headers and the j minimum number of radiation monitor lines required to be operable.

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o ENCLOSURE 3 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-88-14)

DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATIONS 0

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3 ENCLOSURE 3 l Significant Hazards Evaluation TVA has evaluated the proposed technical specification change and has determined that it does not represent a significant hazards consideration eased on criteria established in 10 CFR 50.92(c). Operation of SQN in accordance with the proposed amendment will nots (1) Involve a significant increase in the probability or consequences of an accident previously evaluated. This technical specification change involves only clarification to the original effluent release radiation monitoring configuration of the LC0 in accordance with GDC 64 and RG 1.21 for SQN.

(2) Create the possibility of a new or different kind of accident from any previously analyzed. There has not been any change in plant hardware or configuration to the ERCW radiation monitoring system that could result in an accident because of this technical specification.

(3) Involve a significant reduction in a margin of safety. The present radiation monitoring limitations for the ERCW effluent remain the same. This technical specification change can only enhance SQN's margin of safety to the environment.