ML20094N009

Proposed Tech Specs Eliminating Selected Response Time Testing Requirements

ML20094N009
Person / Time
Site:	River Bend
Issue date:	11/20/1995
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20094M984	List: ML20094N009 RBG-42191, LAR 95-22,proposing Changes to Ts,By Eliminating Selected Response Time Testing Requirements
References
NUDOCS 9511270328
Download: ML20094N009 (4)

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RPS Instrumentation

. 3.3.1.1 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.3.1.1.16 Verify Turbine Stop Valve Closure and 18 months Turbine Control Valve Fast Closure Trip Oil Pressure-Low Functions are not bypassed when THERMAL POWER is 2: 40% RTP.

SR 3.3.1.1.17 Calibrate the flow reference 18 months transmitters.

1 SR 3.3.1.1.18 ------------------NOTES------------------

1. Neutron detectors are excluded.

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33. For Function 6, "n" equals 4 channels for the purpose of determining the STAGGERED TEST BASIS Frequency.

Verify the RPS RESPONSE TIME is within 18 months on a limits. STAGGERED TEST BASIS RIVER BEND 3.3-6 AmendmentNo.8Qjl.ATER 9511270328 951120 PDR ADOCK 05000458 P PDR

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• License Amendment Request 95-22 l November 20,1995 l Enclosure 4 i

TECHNICAL SPECIFICATIONS BASES MARK-UPS

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.. RPS Instrumentation  !

B 3.3.1.1 i

BASES SURVEILLANCE SR 3.3.1.1.16 (continued)

REQUIREMENTS can be placed in the conservative condition (nonbypass). If placed in the nonbypass condition, this SR is. met and the channel is considered OPERABLE.

The Frequency of 18 months is based on engineering judgment and reliability of the components.

SR 3.3.1.1.18 This SR ensures that the individual channel response times are less than or equal to the maximum values assumed in the accident analysis. The RPS RESPONSE TIME acceptance criteria are included in Reference 10.

As noted, neutron detectors are excluded from RPS RESPONSE TIME testing because the principles of detector oper.ation virtually ensure an instantaneous response time. :In 4ddit.lf6n6f6rifdnctidnsi3M4HindiSMtheEisiopiatedfie6 sops areinotfrelqu;ipedftojbbke~sp6nss3timei[testidLJFosthbse_l FunctionsMresponseitimeytesting(forithe;remainingLchanne bomp'onent s? i s gequ i red e jj Thi si al l owanlcejlsi;s t s'upppted [bf Referese111.1 RPS RESPONSE TIME tests are conducted on an 18 month STAGGERED TEST BASIS. Note 33 requires STAGGERED TEST BASIS.

Frequency to be determined based on 4 channels per trip system, in lieu of the 8 channels specified in Table 3.3.1.1-1 for the MSIV Closure Function. This Frequency is based on the logic interrelationships of the various channels required to produce an RPS scram signal.

Therefore, staggered testing results in response time verification of these devices every 18 months. This Frequency is consistent with the typical industry refueling cycle and is based upon plant operating experience, which shows that random failures of instrumentation components causing serious time degradation, but not channel failure, are infrequent.

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REFERENCES 1. USAR, Figure 7.2-1. j

2. USAR, Section 5.2.2. l l

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RIVER BEND B 3.3-31 Revision No. 4 LATER j a

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RPS Instrumentation B 3.3.1.1

. BASES REFERENCES 3. USAR, Section 6.3.3.

(continued)

4. USAR,' Chapter 15.

5. USAR, Section 15.4.1;6.

6. NED0-23842, " Continuous Control Rod Withdrawal in the Startup Range,". April 18, 1978.

7. USAR, Section 15.4.9.

8. Letter, P. Check (NRC) to G.~Lainas (NRC), "BWR Scram Discharge System Safety Evaluation," December 1,1980, as attached to NRC Generic Letter dated December 9, 1980.

9. NED0-30851-P-A, " Technical Specification Improvement Analyses for BWR Reactor Protection System,"

March 1988.

10. RBS Technical Requirements Manual.

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l RIVER BEND B 3.3-31a Revision No. 4 LATER l