ML17331B070

Proposed Tech Specs 4.6.5.1.b.1,2 & 3,changing Ice Condenser Bed SR from 9 Months to 18 Months

ML17331B070
Person / Time
Site:	Cook
Issue date:	11/15/1993
From:	INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML17331B069	List: ML17331B068 ML17331B070
References
NUDOCS 9311190298
Download: ML17331B070 (15)

Text

Attachment 2 to AEP:NRC:1193 Existing Technical Specifications for Donald C. Cook Nuclear Plant Units 1 and 2 Marked to Reflect Proposed Changes 9311190298 931115 PDR ADOCK" 0500031 5

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CONTAINMENT SYSTEMS SURVEILLANCE RE UIREMEHTS 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 weighing) within each bay. If any basket is found to contain less than 1220 pounds of ice, a representative sample of 20 additional baskets from the same bay shall The minimum average weight of ice from the 20 be'eighed.

additional baskets and the discrepant basket shall not be less than 1220 pounds/basket at a 958 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 1220 pounds/basket at a 954 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 2,371;450 pounds.

3. 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.

one flow passage per bay is found to have an accumulation of If 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.

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 breast 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 least 12 feet for this inspection.

COOK NUCLEAR PLANT - UNIT 1 3/4 6-27 AMENDMENT NO. l08, f21, 138, 144

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SUI VKZILAN&M ~BAHTS Continued shal 1 be constituted of one basket each from ~diaL RNts 1 2 4y 6, 8 and 9 (or from the same roe of an ad5acent bay fox" if ~ ~

a basket vithin fxom a designated xov cannot be obtained veighiag)

~ ach bay. Zf aay basket is found to contain less than 1220 pounds of ice. a xepresentative sample of 20 additioaal baskets the same bay shall b>> veighed. The minimum average veight 'rom of ice from the 20 additional baskets and the discrepant basket shall aot be less than 1220 pounds/basket at a 95% level of confidence.

The ice condenser shall also be subdivided into 3 grcnzpa of baskets, as follovs: Croup 1 - bays 1 through 4, Croup 2 - bays 9 through 16, and Croup 3 - bays 17 through 24. The minimum average ice veight of th>> sample baskets frcna Radial hnrs 1, 2, 4, 6, b and 9 in each gxoup shalL aot be less than 1220 pounds/basket at, a 95% level of confidence.

The minimum totaL ice condensez ice veight at a 95% level of confidence shall be calculated using all ice basket reights determined during this veighing pzogram and shall not be less than 2,371,450 pounds.

3. Verifying, by a visual inspection oi at least xvo flov passages per ice condenser bay, that the acc elation of fzost ox ice on the top deck floor grating, on the intermediate deck and oa flov passages betveen ice baskets aad past lattice frames is restricted to a nominal thickness of 3/8 inches. Zt one flow passage pex bay i.s found to have an accumulation of frost ox ice gzeater than this thickness, a representative sample of 20 additional flov passages from the same bay shall be visuaLLy inspected. If these additional flov passages ax'e found acceptable, the surveillance pzogram may px'oceed considering the single deficiency as unique and acceptable. More thaa one restx'icted flov passage pez bay is evidence of abnormal degradation of the ice condensex.

C ~ 'ht least once per Ld months by verifying, by a visual inspectioa, of

<<ach ice condenser bay, that the accumulation of fzost or ice on the lover plenum support structuxes and tuzaing vance is restricted to a nominal thickness of 3/8 inches. An accumulation of frost ox'ce greater than this thickness is evidence of abnormal degradatioa of the ice condenser.

d. At least once pez 40 months by lifting and vt.sually inspecting the accessible portions of at least tvo ice baskets from each 1/3 of the ice condenser snd verifying that the ice baskets aze fx'ee of detrimental structuzal veer, cracks, corrosion or other damage. The ice baskets shall be rai.sed at least 12 feat for this inspection.

COOK NUCLEAR PLANT - UNIT 2 3/4 6-36 AMENDMENT NO )P,125

CONTAI QlENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems requir ed for the detec-tion 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 rccombiner 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 arons7st>ht~it'h-the'rccommendrtions-of ReguUrtory..Guile..l;7, "Control of Combustible Gas Concentrations in Containment Following a lOCA", March 1971.

3/C.6.5 ICE CONDENSER The r equirements associated with each of the components of the ice condenser ensur e that.thc 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 I CE BED The OPERABILITY of the,ice bed ensures that the required ice inven-tory will 1) be distributed evenly through th~containment bays, 2) con-tain sufficient boron to preclude dilution of the containment sump follow-ing the LOCA and 3) contain suf,icient heat removal capability to condense the reactor system volume released during a LOCA. These conditions arc'.

consistent with the assumptions used in the accident analyses.

The minimum +eight figure of 1220 pounds of ice per basket contains a 10>> conservative allowance for ice loss through sublimation which is a factor of 10 higher than assumed fot the ice condenser design. In the event that observed sublimation. rates 'are equal to or lower than after three years'f operation, the minimum ice baskets de'sign'redictions weight. may be adjusted downward. In addition', the number of ice baskets.

required to be weighted each gI8months may'e reduced after '3. years of ion if such a r eduction is supported by observed sublimation 'data.' 'pera 4.6.5. 2 ICE BED TEHPERATURE HONITORING SYSTEH The OPERABILITY-of the ice bed temperature monitoring system ensures that the capability fs available for. monitoring the ice temperature. In

the event the monitoring system is inoperablc, the ACTION requirements provide assurance that the ice bed heat removal capacity will. be retainei within the specified time limits.

D. C. COOK - UNIT 2 B 3/4 6-.4 amendment No, 1

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Attachment 3 to AEP:NRC:1193 Proposed Technical Specifications for Donald C. Cook Nuclear Plant Units 1 and 2

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CONTAINMENT SYSTEMS SURVEILLANCE RE UIMDKNTS 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 weighing) within each bay. If any basket is found to contain less than 1220 pounds of ice, a representative sample of 20 additSonal baskets from the same bay shall The minimum average weight of ice from the 20 be'eighed.

additional baskets and the discrepant basket shall not be less than 1220 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 mSnimum 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 1220 pounds/basket at a 954 level of confidence.

The mininmn total Sce condenser ice weight at a 95% level of confidence shall be calculated using all ice basket weS.ghts determined during this weighing program and shall not be less than 2,371',450 pounds.

3. Verifying, by a visual inspectS. on of at least two flow passages per Sce 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.

one flow passage per bay is found to have an accumulation of If frost or ice greater than this thickness, a representative sample of 20 addi.tional 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.

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 breast 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 least 12 feet for this inspection.

COOK NUCLEAR PLANT - UNIT 1 3/4 6-27 AMENDMENT NO. 108, f21, 138i 144

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~VZZXLANCX RE UIEErfEHTS Continued shall be constituted of oae basket each from Radial Loca 1, 2, 4, 6, 8 and 9 (or tzoa the same rov of an ad)aceat bay if a basket from a designated rov cannot be obtained tor veighing) vithin each bay. If any basket is found to contain less than 1220 pounds of ice, a representative sample of 20 additioaal baskets from the same biy shall be veighed. The minimums average veight of ice troa the 20 addi.tional baskets ind the discrepant basket shall not be less than 1220 pounds/basket at a 95% level of confidence.

The i.ce condenser shall also be subdivided into 3 groups of baskets, is follovs: Czoup 1 - bays 1 thzough 8, Croup 2 - bays 9 through 16, aad'Croup 3 - bays 17 through 24. The aCaima average ice veight of the sample baskets from kadial kcnrs 1, 2, 4, 6, 8 iad 9 in each group shall not be less chan 1220 pounds/basket ac a 95% level of confi.dence.

The minimum total i.ce condenser ice vei.ghc, at a 95% level of confidence shill be calculated using all ice basket reights determined during this veighing program ind shall not be less thin 2,371,450 pounds.

3. Verifying, by a visual inspection oi ic least tvo flov passages pez i,ce condenser bay, that the acc elation of frost or ice on che top deck floor grating, on the 'ncermediate deck and on flov passages becveen ice baskets ind past liccice frames is restricted to a nominal thickness of 3/8 inches. If one flov passage per biy is found to have an accumulation of troat or ice gzeacer than this thi.ckness, i representacive sample of 20 addi.tioaal tlov passages from the same bay shall be visually inspected. If these additional flov passages are found acceptable, the surveillance program may proceed considering the single deficiency is unique and acceptable. More than one restricted flov passage per bay is evidence ot abnormal degradation of the ice condensez.

C ~ 'At least once per 18 months by verifying, by a visual inspection, of eich ice condenser bay, that the accumulation of trosc or ice on the lover plenum support structures ind turning vines is restricted to a nominal thickness of 3/8 inches. An accmxlation of frost or i.ce greater than this thickness is evidence of abnormal degridatioa of the ice condenser.

d. At least once per 40 months by lifting ind visually inspecting the accessibLe portions of at least tvo i.ce baskets from each 1/3 ot the ice condenser ind verifying that the ice baskets ize tree of detrimental structural veer, cracks, corrosion or other damage. The ice baskets shall be raised ac lease 12 feet for this inspection.

COOK NUCLEAR PLANT - UNIT 2 3/4 6-36 AMENDMENT NO PP,125

CONTAItPENT SYSTEMS BASES 3/4.6.4 COMBUSTIBLE GAS CONTROL Thc OPERABILITY of the equipment and systems required for the and control of. hydrogen gas ensures 'that this equipment will.'be detec'-'ion available to mafntafn the hydrogen concentration within containment below its flaim-,ible limit during post-LOCA conditions. Either recombfner unit fs capable of controlling the expected hydrogen generation associated with

1) zirconium-water reactions, 2) radfolytfc decomposition of water and 3) corrosion of metals within containment. These hydrogen control systems ar e'onsisfMt~fth-the recammendrtfons-of Regubitory .Gu&c..l;7,. "Control of Combustible Gas Concentrations fn Containment Following a LOCA", March lg71.

3/4.6.5 ICE CONDENSER The requirements associated with each of the components of the ice condenser ensure that.thc overall system will bc available to provide sufficient pressure suppression capability to limit thc containment peak pressure transient to 1ess than 12 psfg during LOCA conditions.

ICE BED '/4.6.5.1 The OPERABILITY of thc.ice bed ensyres that the required fce inven-tory will 1) be distributed evenly through th~contafnment bays, 2) con-tain sufficient boron to preclude dilution of the containment sump follow-ing the LOCA and 3) contain sufficient heat removal capability to condense the reactor system volume .re1eased during a LOCA. 'These conditions are'.

consistent with the assumptions used in the accident analyses.

The minimum ~eight figure of 1220 pounds of ice per basket contains a 10>> conservative aliowa'nce for ice. loss through sublimation which is a factor of 10 higher than assumed for the fce co~denser design. In the

'vent that observed sublimation.rates 'hre equal to or lower than design, predict/ons after three years of operation, the minimum ice baskets

~eight may be adjusted downward. In addition', the number of fce baskets required to be weighted each j.8 months may'e reduced after '3. years of

'0 if such a reduction is supported by observed sublimatfon'data,' 'peration 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 fce temperature.. In" the event thc monitoring system is inoperable, the ACTION requirements provide assurance that thc ice bed heat removal capacity will. be retafnei within the specified time limits.

D. C. COOK - UNIT 2 B 3/4 6-.4 Amendment Na, 1

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