ML20216C258

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Proposed Tech Specs 3.4.10 Re RCS Leakage Detection Instrumentation
ML20216C258
Person / Time
Site: 05200003
Issue date: 08/31/1997
From:
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20216C256 List:
References
NUDOCS 9709080254
Download: ML20216C258 (3)


Text

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, 3.4.10 I

. 3.4 REACTOR COOLANT SYSTEM (RCS) 3.4.10 RCS Leakage Detection Instrumentation LC0 3.4.10 The following RCS leakage detection instrumentation shall be OPERABLE:

a. One containment sump level channel:
b. One containment atmosphere radioactivity monitor (gaseous N13/F18).

............................N0TE ... ..- ... -

The N13/F18 containment atmosphere radioactivity monitor is only required to be OPERABLE in MODE 1 with RTP > 20%.

APPLICABILITY: MODES 1, 2, 3. and 4.

............................N0TE - -

Containment sump level measurements cannot be used for leak detection if leakage is prevented from draining to the sump such as by redirection to the IRWST by the containment shell gutter drains.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME Two A. Sequired containment -

NOTE - -

sump channels LC0 3.0.4 is not applicable.

inoperable. - - - -

A.1 Perform SR 3.4.8.1 (RCS Once per inventory balance). 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> AND Ont Y h0D A.2 Restore 3 containment sump 30 deys channel to OPERA 8LE status.

(continued) h AP600 3.4 15 08/97 Amendment 0 APC1unneoec\16010410 #07 073097 9709080254 970829 PDR ADOCK 052C V.)O3' A DR

i m teosaye veceuiva uiscrumentation B 3.4.10 BASES APPLICABILITY H0 DES 1, 2, 3, and 4, the likelihood of leakage and crack (continued) propagation are much smaller. Therefore, the requirements of this LCO are not applicable in MODES 5 and 6.

Contain sump level monitoring is a valid method for detecting leakage in MODES 1, 2, 3, and 4. The containment atmosphere N13/F18 radioactivity leakage measurement during H00E 1 is valid only for reactor power > 20% RTP. RCS inventory monitoring via the pressurizer level changes is valid in H0 DES 1, 2, 3, and 4 only when RCS conditions are stable, i.e., temperature is constant, pressure is constant.

no makeup and no letdown.

The containment sump level change method of detecting leaks during H0 DES 1, 2, 3 and 4 is not valid while containment purge occurs or within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after the end of containment purge.

l The containment atmosphere N13/F18 radioactivity leakage measurement during MODE 1 is not valid while containment purge occurs or within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after the end of containment purge.

The containment sump level change method of detecting leaks during MODES 1, 2, 3, and 4 is not valid during extremely cold outside ambient conditions when frost is forming on the interior of the containment vessel, ACTIONS A.1 and A.2 No With the required containment sump level channel 5 inoperable, no other form of sampling can provide the equivalent information: however, the containment atmosphere N13/F18 radioactivity monitor will provide indications of changes in LEAKAGE. Together with the atmosphere monitor, the periodic surveillance for RCS inventory balance, SR 3.4.8.1, must be performed at an increased frequency of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to provide information that is adequate to detect LEAKAGE.

Restoration of tksump channel to OPERABLE status is required to regain the function in a Completion Time of SON N days after the monitor's failure. This time is acceptable, considering the frequency and adequacy of the RCS inventory balance required by Action A.1, (continued) h AP600 B 3.4 43 08/97 Amenchnent 0 AP01\seosoecs t &O30410 f07 071197

m,a teoAage vecection anstrumentation

. B 3.4.10 s

. BASES ACTIONS A.1 and A.2 (continued)

Required Action A.1 is modified by a Note that indicates that the provisions of LC0 3.0.4 are not applicable. As a result, a MODE change is allowed when the containment sump channels finoperable. This allowance is provided because other instrumentation is available to monitor RCS Leakage.

B.1.1 B.1.2. and B.2 With one gaseous N13/F1B containment atmosphere radioactivity monitoring instrumentation channel inoperable, alternative action is required. Either grab samples of the containment atmosphere must be taken and analyzed or RCS inventory balanced, in accordance with SR 3.4.8.1. to provide alternate periodic information.

With a sample obtained and analyzed or an RCS inventory balance performed every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the reactor may be operated for up to 30 days to allow restoration of the radioactivity monitor.

The 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> interval for grab samples or RCS inventory balance provides periodic information that is adequate to detect LEAKAGE. The 30 day Completion Time recognizes at i

least ene other form of leak detection is available.

Required Action B.1 and Required Action B.2 are modified by a Note that indicates that the provisions of LC0 3.0.4 are not applicable. As a result, a MODE change is allowed when the gaseous N13/F18 containment atmosphere radioactivity monitor channel is inoperable. This allowance is provided because other instrumentation is available to monitor for RCS LEAKAGE.

C.1 and C.2 If a Required Action of Condition A or B cannot be met within the required Completion Time, the reactor must be brought to MODE 5 where the probability and consequences of an event are minimized. To achieve this status, the plant must be brought to at least M00E 3 within-6 hours and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner without challenging plant systems.

(continued) h AP500 B 3.4 44 08/97 Amendment 0 A80htecaspeco 6030410 07 073097