ML20196B792

Proposed Tech Specs Re Surveillance Requirements & Leak Rate Testing of MSIVs

ML20196B792
Person / Time
Site:	Quad Cities
Issue date:	11/16/1988
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20196B790	List: ML20196B784 ML20196B792
References
NUDOCS 8812070034
Download: ML20196B792 (4)

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ATTACIMENT 1 f

PROEOSED_CEAltGEILTD_AEEElf DlX_A TECISilCAL_SEICIPICATIDets ron QUAD._C171ER_12ATIQt_Ull12s i and 2 FACILITY OEEAATIMG_ LICENSEE _ DER-11_AllD_DPR-30 Revisad_Engts: 3.7/4.7-4 (DPR-29 & DPR-30)

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ATTACIMENI_2 SUMMARLOf._CilANGES A total of two (2) changes to the Quad Cities Station Units 1 and 2 Technical Spec 1fications have been identified (1 per unit) and are listed below as follows:

1) Eage_3,144 .1 - 4,_S ur v eilla ncn_.R equir ement J S . A l Technical _ Specification _4,1.A,s_.2nde2 - Replace the p' rase "once per 18 months" with "once per operating eyele of a frequency not to exceed 24 months", so the sentence now reads "Hain ste am isolation valves, which shall be leak tested at least once per operating cycle at a frequency not to exceed 24 months...."

This changes the MSIV LLRT interval from 18 to 24 months.

This change would still meet the requirements of 10 CFR 50 Appendix J for MSIV testing intervals and would make the intervals for MSIV LLRT's consistent with the intervals for other primary containment isolation valves.

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EVALU AIIDtLOIJi!SKII1 CART _liA 3 ARDS30tiSIDEDILON l

AN D_DE SC RIEIlotLDr_fROPDSED_ AMEN DMENI_REQUE ST Commonwealth Edison Company proposes to nmend operating Licenses DPR-29 and DPR-30 for Quad Cities Station concerning the intervals at which Local Leak Rate Tests (LLRT's) must be performed on the Main Steam Isolation Valvts (MSIV's).

This Technical Specification change requires the testing to be performed once per operating cycle, but in no case sna11 the interval between tests exceed 24 months. The 24-month maximum interval is specified in 10 CTR 50, Appendix J, for all primary containment isolation valves.

The current Technical Specification testing interval is 18 months.

When this Technical Specification was originally drafted, the plant was operating on 12-month cycles. Thus, the 18-month testing interval per the Technical Specifications was deemed acceptable.

Subseq'uently, the operating length has been extended to 18 months for a fuel cycle. However, the Technical Specification 18-month t.esting interval was never revised to account for these longer fuel cycles. The MSIV's are leck rate tested immediately after the unit has been shut down for a refueling outage. If the MSIV passes the LLRT, it will not be tested again until the beginning of the nr.at refuellny outages that translates into the length of the refueling outage plus a normal operating cycle which is usually 18 montis.

As a result, the MSIV's may be required to be tested before the unit reaches the next refueling outage. To prevent such an unnecessary shutdown, Commonwealth Edison is seeking approval of this proposed amendment.

These changes have been reviewed by Commonwealth Edison and we believe that they do not present a significant hasards consideration. The basis for our determination is documented as follows:

BAS IS _ EO R_N0_SISt'IrlCANTJiA ZARD SlCH S ID E RATICti Commonwealth Edison has evaluated this proposed unendment and determined that it involves no significant hazards consideration. In accordance with the criteria of 10 CTR 50.92(c), a proposed meendment to an operating license involves no significant hasards considerations it operation of the facility, in accordance with the proposed snendment, would nott

1) Involve a significant increase in the probability or consequences of an accident previously evaluated because:

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- 2 (a) Currently, all primary containment isolation valves, except l for the MSIV's, have 24 month testing intervals, as required by 10 CFR 50 Appendix J. Modifying the current testing interval for the MSIV's to conform with the Appendix J interval will not affect any previously evaluated accidents, i since the testing will still be performed within the required guidelines for primary containment isolation valves. ,

Previously evaluated accident do not address the leak rate testing intervals for primary containment isolation valves.  !

Therefore, this does not involve a significant increase in the probability or consequence of an accident previously evaluated.

2) Involve a significant reduction in the margin of safaty j becauset i

All primary containment isolation valves, except for the r MSIV's are leak rate tested at maximum intervals of 24 months -

in accordance with the Code of rederal Regulations. This interval is not viewed as causing a reduction in any margin of  ;

safety for the plant. Therefore, testing the MSIV's at this interval will not reduce any margin of safety. .

3) Create the possibility of a new or different kind of a:cident ,

from any accident previously evaluated becauset I performing local leak rate tests on the MSIV's at a maximum  !

Interval of 24 months as specified in 10 CFR 50, Appendix J,  !

will not create the possibility of a new or different kind of l accident than any previously evaluated since the valves will i continue to be tested at regular intervals similar to other primary containment isolation valves. [

Therefore, the proposed unendment does not create tha h possibility of a new or different kind of accident than l previously was evaluated. l Therefore, since the proposed license mmendment satisfies the  !

criteria specified in 10 CTR 50.92, Commonwealth Edison has determined that a no significant hasards consideration exist for these items. We further ,

request their approval in accordance with the provisions of 10 CFR [

50.91(a)(40). l l

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