ML17333B075

Proposed Tech Specs 3/4.6.5 & 3/4.5.5 Re Ice Weight & SR

ML17333B075
Person / Time
Site:	Cook
Issue date:	10/08/1997
From:	INDIANA MICHIGAN POWER CO.
To:
Shared Package
ML17333B076	List: ML17333B075 ML17334B656
References
NUDOCS 9710150016
Download: ML17333B075 (31)

Text

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P ONTAINMENT SYSTEMS VEILLANCE RE UIREMENTS Continued shall be constituted of one basket each from Radial Rows 1, 2, 4, 6, 8 and 9 (or from the same row of an adjacent bay if a basket from a designated row cannot be obtained for contain less than ~

weighing) within each )ag. If any basket is found to pounds of ice, a representative sample of 20 additional baskets from the same bay shall The minimum average weight of ice from the 20

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be'eighed.

additional baskets and the discrepant basket shall not be less than pounds/basket at a 95% level of confidence.

f3>g The ice condenser shall also be subdivided into 3 groups of baskets, as follows: Group 1 - bays 1 through 8, Group 2-bays 9 through 16, and Group 3 - bays 17 through 24. The minimum average ice weight of the sample baskets from Radial than ~

Rows 1, 2, 4, 6, 8 and 9 in each group shall not be less UH pounds/basket at a 95% level of confidence.

The minimum total ice condenser ice weight at a 95% level of confidence shall be calculated using all ice basket weights less than ~~~

determined during this weighing program and shall not be 2i+4'o(

pounds.

Verifying, by a visual inspection of at least two flow passages per ice condenser bay, that the accumulation of frost or ice on the top deck floor grating, on the intermediate deck and on flow passages between ice baskets and past lattice frames is restricted to a nominal thickness of 3/8 inches. If one flow passage per bay is found to have an accumulation of frost or ice greater than this thickness, a representative sample of 20 additional flow passages from the same bay shall be visually inspected. I f these additional flow passages are found acceptable, the surveillance .program may proceed considering the single deficiency as unique and acceptable. More than one restricted flow passage per bay is evidence of abnormal degradation of the ice condenser.

c At least once per 18 months by verifying, by a visual inspection, each ice condenser bay, that the accumulation of frost or ice on the lower inlet plenum support structures and turning vanes is restricted to a nominal thickness of 3/8 inches. An accumulation of frost and ice greater than this thickness is evidence of abnormal degradation of the ice condenser.

d. At least once per 40 months by lifting and visually inspecting the accessible portions of at least two ice baskets from each 1/3 of the ice condenser and verifying that the ice baskets are free of detrimental structural wear, cracks, corrosion or other damage. The ice baskets shall be raised at lease 12 feet for this inspection.

OK NUCLEAR PLANT - UNIT 1 3/4 6-27 AMENDMENT NO. 108, 121, 138, 144

CONTAIN'.ENT SYSTEMS BASES 3/4.C.5 ICE CONDENSER The requirements associated with each of the components of the ice .

condenser ensure that the overall system will be available to provide sufficient pressure suppression capability to limit the containment peak pressure transient to less than 12 psig during LOCA conditions.

3/4.6.5.1 ICE BED

.he OPERABILITY of the ice bed ensures that the required ice inventory will 1) be distributed evenly through the containment bays, 2) contain su=ficient boron to preclude dilution of the containment sump following the LOCA and 3) contain sufficient heat removal capability to condense t~e reactor system volume released during a LOCA. These conditions are consistent with the assumptions used in the accident analyses.

e;e yy, Bit' t

The minimum i1 f i

/333 1 h gh bl'n weight figure of +220" pounds of ice per basket contains the tnat observed sublimation rates are equal to or lower than design predictions after three years of operation, the minimum ice baskets weignt maq be adjusted downward. In addition, the number of ice baskets required to be ~eighed each 18 months may be reduced after 3 years of operation if such a reduction is supported by observed sublimation data.

3/<.6..2 ICE BED TEMPERATURE MONITORING SYSTEM The OPERABILITY of the ice bed temperature monitoring system ensures that the capabi1ity is available for monitoring the ice temperature. In the event the monitoring system is inoperable, the ACTION requirements provide assurance that the ice bed heat removal capacity will be retained within the specified time limits.

D. C. COOK-UNIT 1 Bd/4 6-4 Amendment No. 180

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COHTAIHQBiT SYS~

SURVEILLAHCK RE U~~3 Q The minimum weight figure of 4ZZQ paunds of ice per basket contains

'tN i 1'I t i 1 h gh bii In the event. that observed sublimation rates are equal to or lowet than design predictions after three years of operation, the minimum ice baskets weight may be adjusted downward. In addition, the number of ice baskets,

- required to be weighed each 18 months may be reduced aFter 3 years of '$

operation if such a reduction is supported by observed sublimation data.

3 4.6.5.2 CE B T MP RATUR MONITORING YSTEH The OPERABILITY of the ice bed temperature monitoring system ensures that the capabi'lity is available for monitoring the ice temperature. In the event the manitoring system is inoperable, the ACTION requirements provide assurance that the ice bed heat remoyal capacity will be retained within the specified time limits.

D. C, COOK - UNIT 2 B 3/4 6-4 Amendment Na. g, 164

3/4 BASES 3/4.5 EMERGENCY CORE COOLING SYSTEMS

~/ip~ cy~4i~e cu/~'i krq+~~

3/4.5.5 REFUELING WATER'TORAGE TANK ~< /t.eel Ic P Mg /CD>

4 ed t'44'ce Mwq /</for ~~

The OPERABILITY of the RWST as part of thc ECCS ensures that sufficient egative reactivity is injected into the core to counteract any positive increase in reactivity caused by RCS syst m cooldown, and ensures that a sufficient supply of borated water is available for injection by the ECCS in the vent of a LOCA. Reactor coolant system cooldown can be caused by inadvertent depressurization, a loss of cool t accident or a steam line rupture.

he limits on RWST minimum volume and boron concentration ensure that I ) sufficient water is available within containment to perinit recirculation cooling flow to the core, and 2) the reactor will remain subcritical in the cold condition following a LOCA assuming mixing of the RWST, RCS, ECCS water, and other sources at may eventually reside in the sump, with all control rods assumed to be out. nsistent with t ePOCAan yses>

cry p licgS/q

'he contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.6 and 9.5 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The ECCS analyses to determine Fp limits in Specifications 3.2.2 and 3.2.6 assumed a RWST water temperature of 70'F. This temperature value of the RWST water determines that of the spray water initially delivered to the containment following LOCA. It is one of the factors which determines the containment back-pressure in the ECCS analyses, performed in accordance with the provisions of 10 CFR 50.46 and Appendix K to 10 CFR 50.

COOK NUCLEAR PLANT-UNIT 1 Page 8 3/4 5-3 AMENDMENT$3, 420, 4$ S, 214

3 /4 BASES 3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.5 REFUELING WATER STORAGE TANK Qe,w ~o~S i ne 4 ~~4 cup E'z~

g<om ~elder /c8, We PCS~ ca< J

% e' cc cc ~ ~ /e t c rs>

The OPERABILITY of the RWST as part of the ECCS ensures t at sufficient negative reactivity is injected into the core to counteract any positive increase in reactivity cause by RCS system cooldown, and ensures that a sufficient supply of borated water is available for injection by th ECCS in the event of a LOCA. Rea system cooldown can be caused by inadvertent depressurizatio, a LOCA or steam line rupture. e limits of RWST minimum volume and boron concentration ensure that 1) sufficient water is available within containment to permit recirculation cooling flow to the core, and 2) the reactor will remain subcritical in the cold condition following a LOCA assuming mixing of the RWST, RCS, ECCS water, and other sources ater that may ally reside in the sump, with all control rods assumed to be out. Consistent with the qpyt/rg(~ LOCA ana yses>

The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.6 and 9.5 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress, corrosion on mechanical systems and components.

The ECCS analyses to determine F< limits in Specifications 3.2.2 and 3.2.6 assumed a RWST water temperature of 70'F. This temperature value of the RWST water determines that of the spray water initially delivered to the containment following LOCA. It is one of the factors which determines the containment back-pressure in the ECCS analyses, performed in accordance with the provisions of 10 CFR 50.46 and Appendix K to 10 CFR 50.

I COOK NUCLEAR PLANT-UNIT2 Page B 3/4 5-3 AMENDMENT4P, 445, 199

ATTACHMENT 3 TO AEP:NRC:0900K PROPOSED CHANGES TO TECHNICAL SPECIFICATIONS

3/4 LIMITINGCONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREitIENTS 3/4.6 CONTAINMENTSYSTEMS 3/4.6.5 ICE CONDENSER ICE BED LIMITINGCONDITION FOR OPERATION 3.6.5.1 The ice bed shall be OPERABLE with:

The stored, ice having boron concentration of at least 1800 ppm (the boron being in thc form of sodium tctraborate), and a pH of 9.0 to 9.5 at 25'C, Flow channels through the icc condenser, A maximum ice bcd temperature of 6 27'F, Each ice basket containing at least 1333 lbs of ice, and 1944 ice baskets.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With the ice bed inoperable, restore the ice bed to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE RE UIREMENTS 0

4.6.5.1 The ice condenser shall be determined OPERABLE:

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 using the ice bed temperature monitoring system to verify that the maximum ice bed temperature is 6 27'F.

At least once pcr 18 months by:

Chemical analyses which verify that at least 9 representative samples of stored icc have a boron concentration of at least 1800 ppm (the boron being in thc form of sodium tetraborate), and a pH of 9.0 to 9.5 at 25'C.

Weighing a representative sample of at least 144 icc baskets and verifying that each basket contains at least 1333 Ibs of ice. The representative sample shall include 6 baskets from each of the 24 ice condenser bays and COOK NUCLEAR PLANT-UNIT 1 Page 3/4 6-26 AMENDMENT&, 480,

3/4 LIMITINGCONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS 3/4.6 CONTAINMENTSYSTEMS Surveillance Re uirements Continued sha Il be constituted of one basket each from Radial Rows I, 2, 4, 6, 8 and 9 (or if from the same row of an adjacent bay a basket from a designated row cannot be obtained for weighing) within each bay. If any basket is found to contain less than 1333 pounds of ice, a representative sample of 20 additional baskets from the same bay shall be weighed. The minimum average weight of ice from the 20 additional baskets and the discrepant basket shall not be less than 1333 pounds/basket at a 95% level of confidence.

The ice condenser shall also be subdivided into 3 groups of baskets, as follows:

Group I - bays I through 8, Group 2- bays 9 through 16, and Group 3 - bays 17 through 24. The minimum average ice weight of the sample baskets from Radial Rows I, 2, 4, 6, 8 and 9 in each group shall not be less than 1333 pounds/basket at a 95% level of confidence.

The minimum total ice condenser ice weight at a 95% level of confidence shall be calculated using all ice basket weights determined during. this weighing program and shall not be less than 2,590,000 pounds.

Verifying, by a visual inspection of at least two flow passages per ice condenser bay, that the accumulation of frost or ice on the top deck floor grating, on the intermediate deck and on flow passages between ice baskets and past lattice frames is restricted to a nominal thickness of 3/8 inches. If one flow passage per bay is found to have an accumulation of frost or ice greater than this thickness, a representative sample of 20 addition'al flow passages from the same bay shall be visually inspected. If these additional flow passages are found acceptable, the surveillance program may proceed considering the single deficiency as unique and acceptable. More than one restricted flow passage per bay is evidence of abnormal degradation of the ice condenser.

At least once per 18 months by verifying, by a visual inspection, each ice condenser bay, that the accumulation of frost or ice on the lower inlet plenum support structures and turning vanes is restricted to a nominal thickness of 3/8 inches. An accumulation of frost and ice greater than this thickness is evidence of abnormal degradation of the ice condenser.

At least once per 40 months by lifting and visually inspecting the accessible portions of at least two ice baskets from each I/3 of the ice condenser and verifying that the ice baskets are free of detrimental structural wear, cracks, corrosion or other damage. The ice baskets shall be raised at least 12 fe'et for this inspection.

COOK NUCLEAR PLANT-UNIT I Page 3/4 6-27 AMENDMENT408, 434, 438, 444,

4 3/4 BASES 3/4.6" CONTAINMENTSYSTEMS 3/4.6.5 ICE CONDENSER The requirements associated with each of the components of the ice condenser ensure that the overall system will be available to provide sufficient pressure suppression capability to limit the containment peak pressure transient to less than 12 psig during LOCA conditions.

3/4.6.5.1 ICE BED The OPERABILITYof the ice bed ensures that the required ice inventory will 1) be distributed evenly through the containment bays, 2) contain sufficient boron to preclude dilution of the containment sump following the LOCA and

3) contain sufficient heat removal capability to condense the reactor system volume released during a LOCA. These conditions are consistent with the assumptions used in the accident analyses.

The minimum weight figure of 1333 pounds of ice per basket contains a 5% conservative allowance for ice loss through sublimation. In the event that observed sublimation rates are equal to or lower than design predictions after three years of operation, the minimum ice baskets weight may be adjusted downward. In addition, the number of ice baskets required to be weighed each 18 months may be reduced after 3 years of operation if such a reduction is supported by observed sublimation data.

3/4.6.5.2 ICE BED TEMPERATURE MONITORING SYSTEM The OPERABILITY of the ice bed temperature monitoring system ensures that the capability is available for monitoring the ice temperature. In the event the monitoring system is inoperable, the ACTION rcquircments provide assurance that the ice bed heat removal capacity will be retained within the specified time limits.

COOK NUCLEAR PLANT-UNIT 1 Page B 3/4 6P AMENDMENT480,

3/4 BASES 3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.5 REFUELING WATER STORAGE TANK The OPERABILITY of the RWST as part of the ECCS ensures that sufficient negative reactivity is injected into the core to counteract any positive increase in reactivity caused by RCS system cooldown, and ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA. Reactor coolant system cooldown can be caused by inadvertent depressurization, a loss of coolant accident or a stcam line rupture.

Consistent with the applicable LOCA analyses the limits on RWST minimum volume and boron concentration ensure that 1) when combined with water from melted ice, the RCS, and the accumulators, sufficient water is available within containment to permit recirculation cooling fiow to the core, and 2) the reactor will remain subcritical in the cold condition following a LOCA assuming mixing of the RWST, RCS, ECCS water, and other sources of water that may eventually reside in the sump, with all control rods assumed to be out.

The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.6 and 9.5 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The ECCS analyses to determine F< limits in Specifications,3.2.2 and 3.2.6 assumed a RWST water temperature of 70'F. This temperature value of the RWST water determines that of the spray water initially delivered to the containment following LOCA. It is one of the factors which determines the containment back-pressure in the ECCS analyses, performed in accordance with the provisions of 10 CFR 50.46 and Appendix K to 10 CFR 50.

COOK NUCLEAR PLANT-UNIT 1 Page B 3/4 5-3 AMENDMENT$ 8, 420, 4$ 8, 244,

3/4 LIMITINGCONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS 3/4.6 CONTAINMENTSYSTEMS 3/4.6.5 ICE CONDENSER ICE BED LIMITINGCONDITION FOR OPERATION 3.6.5.1 The ice bed shall be OPERABLE with:

The stored ice having a boron concentration of at least 1800 ppm (the boron being in thc form of sodium tctraborate), and a pH of 9.0 to 9.5 at 25'C,

b. Flow channels through the ice condenser,

c. A maximum ice bed temperature of 6 27'F,

d. Each ice basket containing at least 1333 lbs of ice, and

e. 1944 ice baskets.

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

ACTION:

With the ice bed inoperable, restore the ice bed to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE RE UIREMENTS 4.6.5.1The ice condenser shall be determined OPERABLE:

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 using the ice bed temperature monitoring system to verify that the maximum ice bed temperature is 6 27'F.

At least once per 18 months by:

Chemical analyses which verify that at least 9 representative samples of stored ice have a boron concentration of at least 1800 ppm (the boron being in the form of sodium tetraborate), and a pH of 9.0 to 9.5 at 25'C.

Weighing a representative sample of at least 144 ice baskets and verifying that each basket contains at least 1333 lbs of ice. The representative sample shall include 6 baskets from each of the 24 icc condenser bays and COOK NUCLEAR PLANT-UNIT2 Page 3/4 6-35 AMENDMENT66) 444,

3/4 LIMITINGCONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS 3/4.6 CONTAINMENTSYSTEMS SURVEILLANCE RE UIREMENTS Continued shall be constit utcd of one basket each from Radial Rows I, 2, 4, 6, 8 and 9 (or from the same row of an adjacent bay if a basket from a designated row cannot be obtained for weighing) within each bay. If any basket is found to contain less than 1333 pounds of ice, a representative sample of 20 additional baskets from the same bay shall be weighed. The minimum average w'ight of icc from the 20 additional baskets and the discrepant basket shall not be less than 1333 pounds/basket at a 95% level of confidence.

The ice condenser shall also be subdivided into 3 groups of baskets, as follows:

Group 1 - bays 1 through 8, Group 2 - bays 9 through 16, and Group 3 - bays 17 through 24. The minimum average ice weight of the sample baskets from Radial Rows 1, 2, 4, 6, 8 and 9 in each group shall not be less than 1333 pounds/basket at a 95% level of rnnfidence.

The minimum total ice condenser ice weight at a 95% level of conflidcnce shall be calculated using all ice basket weights determined during this weighing program and shall not be less than 2,590,000 pounds.

Verifying, by a visual inspection of at least two flow passages per ice condenser bay, that the accumulation of frost or ice on the top deck floor grating, on the intermediate deck and on flow passages between ice baskets and past lattice frames is restricted to a nominal thickness of 3/8 inches. If one flow passage per bay is found to have an accumulation of'frost or ice greater than this thickness,. a representative sample of 20 additional flow passages from the same bay shall be visually inspected. If these additional flow passages are found acceptable, the surveillance program may proceed considering the single deficiency as unique and acceptable. More than one restricted flow passage per bay is evidence of abnormal degradation of the ice condenser.

At least once per 18 months by verifying, by a visual inspection, of each ice condenser bay, that the accumulation of frost or ice on the lower plenum support structures and turning vanes is restricted to a nominal thickness of 3/8 inches. An accumulation of frost or ice greater than this thickness is evidence of abnormal degradation of the ice condenser.

At least once per,40 months by lifting and visually inspecting the accessible portions of at least two ice baskets from each 1/3 of the ice condenser and verifying that the ice baskets arc free of detrimental structural wear, cracks, corrosion or other damage. The ice baskets shall be raised at least 12 feet for this inspection.

COOK NUCLEAR PLANT-UNIT2 Page 3/4 6-36 AMENDMENT90, 43$ ,

3/4 BASES 3/4.6 CONTAINMENT SYSTEMS 3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this equipment will be available to maintain the hydrogen concentration within containment below its flammable limit during post-LOCA conditions. Either recombincr unit is capable of controlling the expected hydrogen generation associated with 1) zirconium-water reactions, 2) radiolytic decomposition of water and 3) corrosion of metals within containment. These hydrogen control systems are consistent with the recommendations of Regulatory Guide 1.7, "Control of Combustible Gas Concentrations in Containment Following a LOCA," March 1971.

3/4.6.5 ICE CONDENSER The requirements associated with each of the components of the ice condenser ensure that the overall system will be available to provide sufficient pressure suppression capability to limit the containment peak pressure transient to less than 12 psig during LOCA conditions.

3/4.6.5.1 ICE BED The OPERABILITYof the ice bed ensures that the required ice inventory will 1) be distributed evenly through the containment bays, 2) contain sufficient boron to preclude dilution of the containment sump following the LOCA and

3) contain sufficient heat removal capability to condense the reactor system volume released during a LOCA. These conditions are consistent with the assumptions used in the accident analyses.

The minimum weight figure of 1333 pounds of ice per basket contains a 5% conservative allowance for ice loss through sublimation. In the event that observed sublimation rates are equal to or lower than design predictions after three years of operation, the minimum ice baskets weight may be adjusted downward. In addition, the number of ice baskets required to be weighed each 18 months may be reduced after 3 years of operation if such a reduction is supported by observed sublimation data.

3/4.6.5.2 ICE BED TEMPERATURE MONITORING SYSTEM The OPERABILITY of the ice bed temperature monitoring system ensures that the capability is available for monitoring the ice temperature. In the event the monitoring system is inoperable, the ACTION requirements provide assurance that the ice bed heat removal capacity will be retained within the specified time limits.

COOK NUCLEAR PLANT-UNIT2 Page B 3/4 6Q AMENDMENT4, 444,

0 3/4 BASES 3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.5 REFUELING WATER STORAGE TANK The OPERABILITY of the RWST as p art of the E CCS ensures that sufficient negative reactivity is injected into the core to counteract any positive increase in reactivity caused by RCS system cooldown, and ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA. Reactor coolant system cooldown can be caused by inadvertent depressurization, a LOCA or steam line rupture. Consistent with the applicable LOCA analyses the limits of RWST minimum volume and boron concentration ensure that 1) when combined with water from melted ice, the RCS, and the accumulators, sufficient water is available within containment to permit recirculation cooling flow to the core, and 2) the reactor will remain subcritical in the cold condition following a LOCA assuming mixing of the RWST, RCS, ECCS water, and other sources of water that may eventually reside in the sump, with all control rods assumed to be out.

The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.6 and 9.5 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The ECCS analyses to determine F< limits in Specifications 3.2.2 and 3.2.6 assumed a RWST water temperature of 70'F. This temperature value of the RWST water determines that of the spray water initially delivered to the containment following LOCA. It is one of the factors which determines the containment back-pressure in the ECCS analyses, performed in accordance with the provisions of 10 CFR 50.46 and Appendix K to 10 CFR 50.

ei COOK NUCLEAR PLANT-UNIT2 Page B 3/4 5-3 AMENDMENT407, 44k, 4QQ,

r ATTACHMENT 4 TO AEP:NRC:0900K DATA SUPPORTING SUBLIMATION RATES

UNIT 1 ICE CONDENSER - ICE BED SUBLIMATIONRATES As-.Left As-Left Date .As-Left Total As-Found As-Found Date As-Found Total Inteival Change in Average Monthly Change Change in File Name (MotYr) ice Mass (M File Name (Mo/Yr) Ice Mass (III) (Months) Ice Mass (I@) ln ice Mass (%/Mo.) Ice Mass (%)

S1 1285 Dec-85 2.823 S1 0686 Jun-86 2.781 0.042 0.25 1.50 S'f0886 Jun-86 2.781 S10687 Jul-87 2.755 0.026 0.07 0.91 S1 0687 Aug@7 2.788 S10388 Mar48 2.707 0.061 0.31 2.17 S10388 'ar-88 2:707 S10389 Mar-89 2.685 12 . 0.022 0.07 0.84 S1 0589 May-8S 2.748 S1 0190 San-90 2.718 0.032 0.15 1.20 S1 0190 San-SO 2.716 S11090 Oct-SO 2.707 0.009 0.04 0.36 S1 1290 - Dec-90 2.762 S1099'I Sep-'91 '2.727 0;035 0.14 1.26 S1 0991 Sep-S1 2.727 S10 892 Sun42 2.746 -0.019 -0.08 -0.72 S1 0992 Sep-92 2.785 S102S4 Feb-94 2.719 17 0.066 0.14

=

2.38 S103S4 Mar-94 2.795 S10895 Aug-95 2.719 0.076 0.16 2.72 S10995 Sep-95 2.753 S10297 Mar-97 2.661 0.092 0.19 3.42 Sum 125 WelghtedAverageChangein iceMass= 0.12832  %/Month Weighted Average Change in lce Mass = 2.31 % f18 monlhs over an 18 month period

UNIT 2 ICE CONDENSER - ICE.BED SUBLIMATIONRATES As-Left As-Left Date As-Lett Total As-Found As-Found Date As-Found Total Interval Change in Average Monthly Change Change tn Rie Name (Mo/Yr Ice Mass (MO) Fife Name (Mo/Yr Ice Mass (M5) (h'tonths) tce Mass (Mt) tn tce Mass (%/Mo.) tce Mass (%

S2 $ 284 Dec-84 2.696 S20885 . Aug@5 2.690 0.03 0.24 SZQ885 Aug45 2.690 S20386 Mar-86 2.598 0.092 0.49 3.43 S20586 May-86 2.776 S20887 Sep.87 2.725 0.051 0.11 1.76 S20887 Sep47 2:744 S20488 May-88 2.717 0.027 0.12 SZ0.189 Jan-89 2.811 S21't89 Nov49 2.769 10 0.042 0.15 1.50 S21189 No v%9 2.769 S20790 JUI-90 2.739 0.03 1.12 820990 Sep-SO 2.775 S20891 Jun%1 2.728 0.047 0.19 1.71 S02691 Jun-91 2.728 S20392 Mar-92 2.717 0.011 0.04 0.36 S20592 May-92 2.838 S20193 Jan-93 2.827 0.011 0.05 040 S20193 Jan-93 2.827 S20894 Sep-94 2.742 20 0.085 0.15 3.00

-S21094 Oct-94 2.821 S20296 Mar-96 2.760 0.13 2.21 S20496 Apr-96 2.833 S 20897 Sep47 2.727 17 0.1O6 0.22 3.74 137 20.43 0/eighted Average Change in Ice Mass = 0:1491241 %/Month 1Neighted Average Change in Ice Mass = 2.68 %/18 months over an 18 month period

ATTACHMENT 5 TO AEP:NRC:0900K

SUMMARY

OF SUMP INVENTORY CALCULATIONS