ML20205A121

Proposed Tech Spec Pages 3/4 6-16 Through 3/4 6-21 Re Limiting Conditions for Operation for Depressurization Sys Suppression Chamber

ML20205A121
Person / Time
Site:	LaSalle
Issue date:	10/07/1988
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20205A119	List: ML20205A113 ML20205A121
References
5209K, NUDOCS 8810250398
Download: ML20205A121 (10)

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TECIALICAL_321CIEICATlas CMattgz REQUERI l

LASALLE COUNTY STATICal UMits i usn 2 i

ERQEOSED_fEAMGES TO APPENDIX.A AKYI54D_EAG15 l

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MPF-11 Myr-13 3/4 6-16 3/4 6-19 3/4 6-17 3/4 6-20 3/4 6-18 3/4 6-21 1

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CONTAINMENT SYSTEMS 3/4.6.2 DEPRESSURIZATION SYSTEMS SUPPRESSIONCHAMBEM LIMITING CONDITION FOR OPERATION 3

3.6.2.1 The suppression chamber shall be OPERABLE with:

/d8 a.

The pool water:

3 3

1.

Volume between 131,900 ft and 12 00 ft, equivalent to a level between 26 ft. 10 in. and 2

t. 2\\ in., and a l

2.

Maximum average temperature of a during OPERATIONAL CONDITION 1 or 2, except that the maximum average temperature may be permitted to increase to:

4

{ a)

IWF,"" dur' ng testing which adds heat to the suppression l]

chamber.

Q %)

110*F with THERMAL POWER less than or equal to 1% of l

RATED THERMAL POWER.

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120'F with the main stears line isolation valves closed l

4 following a scram.

r al to b.

Drywell-to-suppression chamber bypass leakage less th M

Adh hdKf@b 10% of the acceptable A/,/E design value of 0.03 f t.

WhlC APPLICABILITY:

OPERATIONAL CONDITIONS 1, 2, and 3.

the SWftesum pooI, gd ACTION:

a.

With the suppression chamber water level outside

.e

imits, j

V restore the water level to within the limits within 1 ho r tv at least HOT SHUTOOWN within the next y hours and i LO SHUT 00WN

/CS F within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b.

In OPERATIONAL CONDITION 1 or 2 with the s

chamber average water temperature greater than or equa

, restore the average l

temperature to less than or equal to within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT SHUTDOWH within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTD0kH within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, except, as permitted above

[1.

With the suppression chamber average water tempe re greater

[

than 105'F during testing which adds heat to the suppression chamber, stop all testing which adds heat to the suppression chamber and restore the average temperature to less than or equal to 100*F within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 91 hnurt l, /.

With the suppression chamber average water temperature greater 1

than 110'F, place the reactor mode switch in the Shutdown position and operate at least one residual heat removal icop in the suppression pool cooling mode.

l 2/.

With the suppression chamber average water temperature greater i

than 120*F, depressurize the reactor pressure vessel to less than 200 psig within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

1. See Soecificatinn 3.5.3 for ECCS requirements.

Q See Special Test Exception 3.10.8.

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LA SALLE - UNIT 1 3/4 6-16 Amendment No.13

CONTAINMENT SYSTEMS LIMITING CONDITION FOR OPERATION (Continued)

ACTION:

(Continued) c.

With one suppression chamber water level instrumentation channel inoperable and/or with one suppression pool water temperature instrumentation division inoperable, restore the inoperable l

instrumentation to OPERABLE status within 7 days or verify suppres-sion chamber water level and/or temperature to be within the limits at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by local indication, d.

With both suppression chamber water level instrumentatiori channels r

inoperable and/or with both suppression pool water temperature instrumentation divisions inoperable, restore at least one i

inoperable water level channel and one water temperature division to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTCOWN within the following l

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

e.

With the drywell-to-suppression chamber bypass leakage in excess of 2

the limit, restore the bypass leaka'p to within the limit prior to increasing reactor coolant temperature above 200'F.

SURVEILLANCE REQUIREMENTS t

4.6.2.1 The suppression chamber shall be demonstrated OPERABLE:

a.

By verifying the suppression chamber water volume to be within the limits at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

l b.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in OPERATIONAL CONDITION 1 or 2 by verifying the sappression chamber average water temperature to be less than or equal to xcept:

l 1.

At ea once per 5 minutes during testing which adds heat to the suppression chamber, by verifying the suppression chamber j

average water temperature less than o g a y o 105'F.

2 2.

At least once per 60 minutes when suppression chamber average l

water temperature is greater than 4998P, by verifying suppression j

chamber average water temperature less than or equal to 110'F and THERMAL POWER less than or equal to 1% of RATED THERMAL POWER.

r 3.

At least once per 30 minutes following a scram with suppression chamber average water temperature greater than or equal to

/0$8[499Y, by verifying suppression chamber average water terperature t

less than or equal to 120*F.

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LA SALLE - UNIT 1 3/4 6-17 Amendment No.18

CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Conthued)

By verifying at least two suppression chamber water level instru-

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mentation channels and at least 14 suppression pool water temperature instrumentation channels, 7 in each of two divisions, OPERABLE by performance of a:

1.

CHANNEL CHECK ct least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 2.

CHANNEL FUNCTIONAL TEST at least once per 31 days, and 3.

CHANNEL CALIBRATION at least once per 18 months, with the water level and temperature alarm setpoint for:

I 1.

High water level 126 f t 8 in.

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2.

Lowwaterlevel>26ft.Ain.

IOS F

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3.

High temperature $ W F l

d.

By conducting drywell-to-suppression chamber bypass leak tests and verifying that the A/6 calculated from the measured leakage is I

I within the specified limit wher, drywell-to-suppression chamber bypass leak tests are conducted:

1.

At least once per 18 months at an '.i tial differential pressure i

I of 1.5 ps:, and l

2.

At the first refueling outage and then on the schedule required f$r Type A Overall Integrated Containment Leakage Rate tests by Spect-fication 4.6.1.2.a; at an initial dif ferential pressure of 5 psi, l

except that, if the first two 5 psi leak tests performed up to that time result in:

1, A calculated A/8 within the specified limit, and 2.

The A/8 calculated from the leak tests at 1.5 pst is < 20% of l

the specified limit, then the leak tests at 5 psi may be discontinued.

l tA SALLE - UNIT 1 3/4 6-18

/cendment No. 18

CONTAINMENT SYSTEMS 3/4.6.2 DEPRESSURIZATION SYSTEMS r

l SUPPRESSION CHAMBERf l

LIMITING CON 0! TION FOR OPERATION t

3.6.2.1 The suppression chamber shall be OPERABLE with:

i a.

The pool water:

/05 P 1.

Volume between 131,900 ft8 and 128 8

ft, equivalent to a level between 26 ft 10 in, and 26 2

in., and a 2.

Maximum average temperature of= tee 4 during OPERATIONAL CONDITION 1 or 2, except that the maximum average temperature may_be peraftted to increase to:

(

[a) 105'F, during testing which adds heat to the suppression L

chamber.

4 %)

110'F with THERMAL POWER less than or equal to 1% of I

RATED THERMAL POWER.

i b \\)

120'F with the main steam line isolation valves closed I

following a scram.

b.

Drywell-to-suppression chamber bypass leakage less thsn t

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107, of the acceptable A/d design value of 0.03 f 8 ggg APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

,ggg he fo gy g fffflM eedl, M d ACT10N:

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a.

Wit.h the suppression chamber water level outsi 11 s,

l restore the water level to within the limits within 1 hou be j

at least HOT SHUTD0hH within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in SHUT 00hN i

dithin the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. /pg*f j

b.

In OPERAY10NAL CONDITION 1 or 2 with th ss chamber average l

water temperature greater than or equa

, restore the average l

temperature to less than or equal to F within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in t

at least HOT SHUT 00hN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUT 00hh within the fc.11 ewing 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, except, as permitted above:

1.

With the suppression chamber average water temperature greater than 105'F during testing which adds heat to the suppression cham-ber, stop all testing which adds heat to the suppression chamber and restore the average temperature to less than or equal to 100'F j

within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT SHUTOOWN within the next l

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and in COLD SHUT 00hh within the followino 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

l l/.

With the suppression chamber average water temperature greater than 110'F, place the reactor mode switch in the Shutdown i

position and operate at least one residual heat removat loop in i

the suppression pool cooling mode.

2 /.

With the suppression chamber average water temperature greater than 120'F, depressurize the reactor pressure vessel to less than 200 psig within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

eSee Specification 3.5.3 for ECCS requirements.

LA SALLE - UNIT 2 3/4 6-19

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i CONTAINMENT SYSTEMS l

Lid! TING CONDITION FOR OPERATION (Continued) l l

ACTION:

(Continued) 1 r.

With one suppression chamber water level instrumentation channel inoperable and/or with one suppression pool water temperature J

instrumentation division inoperable, restore the inoperable instrumentation to OPERABLE status within 7 days or verify suppres-ston chamber water level and/or temperature to be within the limits at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by local indication, d.

With both suppression chamber water level instrumentation channels inoperable and/or with both suppression pool water temperature j

instrumentation divisions inoperable, restore at least one inoperable water level channel and one water temperature division to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT SHUTOOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following l

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

e.

With the drywell to-suppression chamber bypass leakage in excess of the limit, restore the bypass leakage to within the limit prior to increasing reactor coolant temperature above 200'F.

SURVE!LLANCE REQUIREMENTS

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4.6.2.1 The supprirssion chamber shall be demonstrated OPERABLE:

I a.

By verifying the suppression chambar witer volume to be within the lirits at least c.ce per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

f b.

4 teast once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in OPERATIONAL CONDITION 1 or 2 by verifying the suppressie chamber average water temperature to be less than or i

equal to 944ag, exe,pg

/O.5 *F 1.

At least once per 5 minutes during testing which adds heat to the suppression chaster, by verifying the suppression chamber average water temperature less than or equal to 105'F.

l 2.

At least once per 60 minutes when stppression chamber average l

water temperature is greater than b 44, by verifying suppression chamber average water temperature lj than or equal to 110'F l

and THERMAL POWER less snan or equal 1% of RATED THERSAL t

POWER.

/dff l

1 3.

At least once per 30 minutes following a scram with suppression chamber average water temperature greater than or equal to i

/05*/48a**. by verifytas suppressten chamber avercs' water te20erature less than or equal to 120'F.

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l LA SALLE - UNIT 2 3/4 6-20

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y CONTAINMENT SYSTEMS SURVEILLANCE S QUIREMENTS (Continued) c.

By verifying at least 2 suppression chamber water level instru--

mentation channels and at least 14 suppression pool water temperature instrtrentation channels, 7 in each of two divisions, OPERABLE by performance of 2:

1.

CHANNEL CHECK at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 2.

CHANNEL FUNCTIONAL TEST at least once per 31 days, and 3.

CHANNEL CALIBRATION at least once per 18 months, with the water level and temperature alarm setpoint for:

1.

High water level $ 26 ft 8 fn.

2.

Lo'w water level > 26 f t 4 in.

High temperature s e /05 *F 3.

d.

By conducting drywell-to-suppression chamber bypass leak tests and

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verifying that the A/8 calculated from the measured leakage is within the specified limit when drywell-to-suppression chamber bypass leak tests are conducted:

1.

At least once per 18 months at an initial differential pressure of 1.5 psi, and 2.

At the first refueling outage and then on tr.: schedule required for Type A Overall Integrated Contai.'. ment Leakage Rate test 3 by Spect-fication 4.6.1.2.a., at an initial differential pressue3 nf 5 psi, except that, if the first two 5 psi leak tests performed up to that time result in:

1.

A calculated A/8 within the specified limit, and 2.

The A/ 8 calculated from the leak tests at 1.5 psi is 1 20% of the specified limit, then the leak tests at 5 psi may be discontinued.

LA SALLE - UNIT 2 3/4 6-21

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P c I.

r AIZACE M I C IECHNICAL SPECIFICATIM CHANGE Rent!EST LASALLE COUNTY STATICM UNITS 1 and 2 i

SUPPLEMEtLTAL SUPPORTING INFORMATIQ(

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ATTACIMEICI_D TECHNICAL SPECIFICATION CHANGE REOUEST LASALL]LCQUNTY STAIlON UNITS 1 AND_1 EVALUATION OF SIGNI]'LCAliT_)iAKA8tDS cot (SIDERATIQt{

Commonwealth Edison has evaluated the proposed Technical Specif1-cation Amendment and determined that it does not represent a significant hazards consideration. Based on the criteria for defining a significant 2 -

hazards consideration established in 10 CFR 50.92, operation of LaSalle County Station Units 1 and 2 la accordance with the proposed amendment will nat 1)

Involve a significant increase in the probability or consequences of an accident previously evaluated becausu this change has been evaluated against those criteria for which the original limit of 100'T was established.

It has been concluded that the original limit of 700'r includes conservatisms which were not expected to cause operational Impact. However due to unfereseen external environm9ntal conditions, some of the conservatism may be reduced without signif'

.: impact on plant safety.

2) Create the possibility of a new or different kind of accident from any accident previously evaluated because the change does not add or remove plant equipment or affect how this equipment is operated. The plant has been evalutced for various conditions relating to the suppression pool temperature previously 'nd this change will not provide conditions with the possibility for a no or different accident.

3)

Involve a significant reduction in the margin of safety because the basis for Technical Specification 3/4.6.2 shows the margin between the analyzed teinperature rise in the suppression pool during blowdown and the ultimate limit of 200'r is large even with a new initial suppression pool temperature of 110*P.

Therefore any reduction in the margin of safety is not significant.

Guidanc. has been provided in 51 Fr 7744 for the application of standards to license change requests for determination of the existence of significant hasards considerations. This document provides examples of snendments which are and are not likely considered to involve significaat J

hazards considerations. This amendment request is similar to example (vi) of

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. the examples that are not likely to involve significant hase.ds conside.ation.

Example (lv) is a change which either may result in ?me increase in the probability or consequences of a previously analyzed accident or uay reduce in some way a safety margin, but where the results are clearly within all acceptable criteria with respect to the system or component specified in the Standard Review Plan. This change clearly falls within this example in that the acceptance criteria for the containment as well as other systems which may be affected by suppression pool temperature are not changed. With a higher initial temperature input the appropriate limits are maintained. No accident is more likely to occur due to an increase in the pool temperature since it is a passive system and not an accident initiator. The consequences of previously analyzed accidents is not significantly affected.

This proposed snendment does no.t involve a significant relaxation of the criteria used to establish safety limits, a significant relaxation of the bases for the limiting safety system settings or a significant relaxation of the bases for the limitin9 conditions for operations. Therefore, based on the guidance provided in the Federal Register and the criteria established in 10 CFR 50.92(e), the proposed change does not constitute a significant hazards consideration.

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