ML20044A460

Provides Followup to 900622 Request for Waiver of Compliance Re Tech Spec Limiting Condition for Operation Concerning Standby Emergency Diesel Generator 1B.Rev to Attachment 1 of Original Request for Waiver Encl

ML20044A460
Person / Time
Site:	Clinton
Issue date:	06/22/1990
From:	Jamila Perry ILLINOIS POWER CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
U-601698, NUDOCS 9006290087
Download: ML20044A460 (13)

Text

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7 U-601698 L4 7 -9 0 ( 06-2 2 ) -LP h h 8E.100

' CLINToN ICWEH STATION. I'.o, lloX 678. CLINToN, ILLINOIS 61727M78, TELEI' HONE (217) 935-8881 June 22, 1990 10CFR50.91(a) . (5) 10CFR50.91 PRIORITY ROUTING Docket No. 50-461 I _~5cm1

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Mr. A. B. Davis OR14+ l{ <

Du Z Regional Administrator _

Region III U.S. Nuclear Regulatory Commission h k_

rm 799 Roosevelt Road flLLhuh Glen Ellyn, Illinois 60137

SUBJECT:

Followup to Request for Waiver of Compliance '

Regarding Technical Specification Limiting Condition for Operation Related to Standby l Emergency Diesel Generator 1B-  ;

Dear Mr. Davis:

1 On June 22, 1990, IP discussed with Messrs. E.- -

Greenman and R. Knopp of your staff the request'for a-waiver' of compliance submitted via IP Letter U-601696 )

dated June 22, 1990. During this conversation and-based I on the information provided in Attachment 1 to.this I letter, Mr. Greenman approved a' waiver of compliance 'l regarding the out-of-service time allowed for diesel generator (DG) 1B under the Technical Specification Limiting Condition for Operation (LCO). Under the s i

l granted waiver, the allowed-cut-of-service time'for DG18.

L must not exceed seven days from the time that DG18 wac' removed from service (entry into-the LCO Action Statement). The waiver of compliance will' therefore j expire on or before 0243 on Friday,_ June-29,t1990, unless l l otherwise approved by the NRC.

It should be noted t bat Attachment 1 to this letter-

~is -a revision to Attachtrent 1.of the original re,questL for 1 waiver dated June 22, l')90 (U-601696). as it contains I l additional information. This letter and its: attachments- l ih

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L have been reviewed and approved by the CPS Pacility Review Group. /

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1. n d 9006290087 900622 JU$ g 0 M .

PDR ADOCK 05000461 P- PDC 'I o

IP appreciated your consideration and prompt response to this request.

Sincerely,

=

g J. S. Perry Vice President TBE/rgw l Attachments cc: HPC Clinton Licensing Project Manager ,

NRC Resident Office Illinois Department of Nuclear Safety l

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[ / Attachmsnt-1 to U-601699 1 Page 1 of 8 l 1 .

Descriotion of Condition / Reason'for Recuest-During normal shift rounds at approximately 0200 on June 22, 1990, an operator discovered (via the site glass) that the water level in the jacket cooling water.

expansion tank on DG1B-was' overflowing. From earlier experience, IP_auspected that this may be caused by service water. leaking through the diesel generator heat '

exchanger tubes and-into the DG' jacket cooling water within the associated heat exchangers. (A heat exchanger is provided for each of the two tandem engines (one 16-cylinder and one 12-cylinder) associated with DG1B.] 4 Although the condition described above would not' prevent the.DG from performing its safety function (since the diesel can function with direct service water flow into the cooling jacket), DG1B was removed from service at 0243 hours0.00281 days <br />0.0675 hours <br />4.017857e-4 weeks <br />9.24615e-5 months <br /> for-investigation'and repair.

Microbiologically induced corrosion (MIC) was first identified in the DG heat exchangers at CPS in 1989 as IP was developing and implementing its. response to Generic Letter 89-13 and the associated supplement.* As an l

immediate corrective action, cleaning and closed loop i chemical treatment of the DG heat exchangers were performed during planned outage:3 (PO-3)L(February, 1990)'

to temporarily arrest the.MIC problem. IP is currently.

working towards a long-term solution to the MIC problem, including obtaining an: Illinois' State discharge permit for chemically treating service water on'an open-loop basis and retubing the IX) heat exchangers. (Retubing-of the heat exchanger for DG1A was completed during PO-3.)

The operability requirements (during operational conditions 1,2, and 3) for the emergency standby diesel I generators, including.the actions to be.taken if one (or more) is inoperable, are specified in CPS Technical Specification 3.8.1.1. (See' Attachment'2 of this submittal.) Action "b" requires that with1either diesel generator 1A or 1B inoperable, operability of the required AC offsite sources must be demonstrated, operability of the remaining operable _ diesel generators must be demonstrated (unless_the DG became inoperable solely due to preplanned preventive maintenance or l testing), and the inoperable DG must-be restored;to l operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.. If the inoperable DG l cannot be restored within 72-hours, the plant must be l

brought to a hot shutdown condition within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and to a cold shutdown condition within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Reference:

IP Letter U-601574; dated January 29, 1990

' .'- Attachmont 1

.' to U-601698 Page 2 of 8 .

By-1300 (on June 22, 1990), IP completed.a visual j inspection of the tubes within the heat exchanger

• associated with the 12-cylinder engine. Based on the <

visual inspection performed and previous experience with . 1 MIC in the Division I diesel generator heat exchanger, i tube replacement is required for both heat exchangers ,

l (i.e., the heat exchanger associated with the 12-cylinder '

l engine and the heat exchanger associated with the 16-cylinder engine). This work will not be able to be i completed before the 72-hour time limit expires at 0243 ,

on Monday, June 24, 1990. It is currently estimated that

• an additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> will be needed to complete the retubing and to complete the testing required to reverify ,

operability of DG1B. Regardless, IP does not expect and  !

will not permit the time required for retubing and testing to exceed a total of seven days _from the time DG1B was removed from service.

Descriotion/Secuence of Work to be Performed l The work plan for retubing-both heat exchangers is such ,

that both heat exchangers for DG1B will be repaired in parallel. Because of the size limitation of the DG1B room, the 16-cylinder engine. heat exchanger must be  ;

removed from the skid for retubing. (The 12-cylinder:

engine heat exchanger will be retubed in place.) The 16- ,

cylinder engine heat exchanger work will thus take almost  !

another day more than the repair work for the 12-cylinder- .

engine heat exchanger.. After retubing and rcinstallation of the 16-cylinder engine heat exchanger, pressure -

testing and service water flow balancing will be-l required, followed by performance of a post-maintenance '

surveillance test. IP currently estimates that all of the above will take, approximately, an' additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> beyond the allowed out-of-servico'normally required .-

I by the plant Technical Specifications.

Justification for ProDosed Recuest i The Illinois Power electrical system design provides a diversity of power supplies. The waiver of compliance i for the Clinton Power Station Technical Specification. i (CPS-TS) Limiting Condition for Operation (LCO)-to extend the 72-hour allowed out-of-service time approximately 72 l additional hours is justified partially on this diversity. The 138-kV offsite power system provides ,

power to the station by one three-terminal transmission l

line. This.line connects the station to.the Illinois i Power Company grid at the south Bloomington and Clinton.

Route 54 Substations. Electrical power can be fed to'the-station through the line from south Bloomington or north' Decatur (via Clinton Route 54 Substation) or both. The line terminates directly (through a circuit switcher) at the Emergency Reserve Auxiliary Transformer, which .

transforms the electrical power to 4160-volt auxiliary

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i e- Attachmsnt 1 to U-601698 Page 3 of 8 power bus voltage. The 345-kV Offsite Power System provides power to the station through three separate transmission lines. These lines connect the station to the Illinois Power _ Company grid at the Brokaw, Rising, i and Latham substations. All three lines. terminate at the station switchyard ring bus which feeds the Reserve Auxiliary Transformer, which in turn transforms the electrical power to the 6900-volt and 4160-volt auxiliary  ;

power bus voltage. Only one 138-kV and one 345-kV i feeders are required- by CPS Technical Specifications.

In the unlikely event that the power sources described r above are unavailable, there are two remaining ooerable.

diesel generators on site. Diesel Generator 1A (DG1A) supplies power to Division I electrical equipment and .

DG1C supplies power to Division III electrical equipment.

These operable diesel' generator units are capable of.

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sequentially starting and supplying the power .

requirements for safe shutdown of the plant.- Because of the diversity of the power supplies described above, the increase in the allowable out of service time for DG1B is justified.

With respect to the current statuslof other systems at CPS important to safety, the following are currently but-temporarily out of service. "LCO"s-were entered for these systems-strictly.due to routine maintenance and not ,

because of any discovered / determined conditionlof inoperability, a System Status */ Comments. [

)

(1) Standby Gas Treatment This LCO is expected to Subsystem B clear during the current _ a ~

swing shift. Standby ~ Gas Treatment Subsystem _A is operable.-

(2) Main Steamline Isolation This LCO is currently being i Valve Leakage Control cleared. MSIV-LCS ..

System-(MSIV-LCS) Subsystem A is operable.-

Subsystem B (3) Reactor Core Isolation This LCO is expected to '

Cooling (RCIC) System clear during the upcoming-midnight shift. The HPCS system is operable.

Imminent restoration of the above systems / subsystems-and ,

the operability of redundant systems'provides added '

assurance that the proposed request is justified.

• As of 1800, June 22, 1990.

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.- Attachment-1 to.U-601698 Page 4 of 8 There are tes other plant / equipment conditions of concern surrounding this event. IP is currently monitoring the degradation of the inner mechanical seal on reactor recirculation: pump B as pressure across the inner seal has been observed to be increasing. (The outer seal is-in good condition.) This condition is not considered to be a condition that warrants special consideration regarding the capability to shut down the plant and mitigate the consequences of an accident. The most likely' challenge.to the seal would be when shifting the reactor recirculation pump from slow to fast speed during a plant restart.

The second concern-is.the results of oil testing recently performed on the reserve auxiliary transformer (RAT) which provides power-from-the_ CPS switchyard to the Auxiliary Power (AP) System. The1 transformer is currently in service and is one=of-two-sources of power to the safety-related portion of the AP system. The transformer is rated to carry more than four times the total demand of the~ safety-related portion'of-the AP -

system.

Illinois Power monitors the condition of-transformer oil-in the RAT by taking periodic oil samples and sending them to an independent laboratory for analysis. The results of oil samples taken:in mid June of 1990Lare provided below. Two of the parameters were identified as:

being outside-their recommended normal ranges.

Ranae 6/15* 6/21* 6/22**

Water Content 15-34 ppm 31 ppm 66 ppm --

Dielectric Strength 24-31 kV 30 kV 14 kV 45 kV-The samples were taken during extremely wet, humid weather and are so divergent that they are questionable. Alli other parameters are normal and within.their respective limits. In particular,-the combustible gases are within their normal limits. (Combustible gases are indicative of imminent failure and/or catastrophic damage due'to-internal arcing.)

The RAT has experienced no failures since IP received its operating license in September 1986. The only outage of the off site power from the 345 kV switchyard-occurred in late 1988 due to a failure of a 345 kV switch. This outage was of short duration (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />).

• 0ffsite laboratory test results

• • Onsite test results

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l 1 Attachmant 1: t t

to U-601698 ,

Page 5 of 8  :

i IP believes the test results indicate that the RAT requires closer attention, but it is not inoperable and is still capable of performing its intended function.  !

However, IP has sent samples to two different '

laboratories so that the recent test results can be further evaluated. Test results are expected next Monday (June 25, 1990). If the' test results for the RAT oil ,

samples are unsatisfactory,'IP_will take appropriate action to shut down the plant.  ;

Regarding the need for maintaining the plant on line, CPS is presently generating approximately 60 percent of the total electrical IP customer load.

The current status of other Illinois Power Generating-Stations islas follows:

Expected ,

Return-to-Service  !

Unit Status 'Date l Baldwin 1 (540 MW) off-line 6/25/90 Baldwin 3 (540 MW) off-line 7/23/90 Havana 6 (410 MW) off-line 6/25/90 t It is estimated that if CPS must be shut down, and all;of the available IP units are in operation, IP will=need to'

• purchase at least 500 megawatts of power and must interrupt 1 service to the interruptible' customers ono Monday (June 25). If Baldwin 1.and Havana 6 are not available, then IP'will need to purchase at least 1200  ;

megawatts (and discontinue service to1the-interruptible -

customers). Peaking Units (Gas. Turbines) are not included in this forecast.

Additional *Mitiaatina Conditions IP contacted the National Weather Service ~ (NWS) .in i Springfield, Illinois to consider the current and .i expected weather conditions for the immediate service area. The NWS reported that clear weather is: forecast for the weekend. The NWS indicated that there is only a ,

slight chance of thunderstorms on Monday (June 25) and

, that the next possibility of thunderstorms is on Wednesday or Thursday (June 27 or 28).

Comoensatory Actions The remaining. operable diesel generators are ready to-perform their intended function in the unlikely event  :

that they are needed. In addition, no testing will be performed that might create a transient.to normal plant conditions (other than the normal -surveillance testing  ;

1 t

Attschmsnt.1 e to U-601698 -1

'Page 6 of 8 required to satisfy Technical Specification requirements) ,

during the extended time interval. Also,.no systems or t equipment important to' safety which are associated with t

the redundant safety-related division (Div. I) will be removed from service for electric _ maintenance during the  :

extended time' interval. ]

Safety Sianificance/ Basis for No Sionificant Hazards l Consideration

=f l IP does not consider this request to be safety L significant in view-of the following:

! i As noted previously, only the Division II DG is  :

1) '

, currently inoperable. .As offsite power is also l available,-sufficient redundancy exists (assuming no l concurrent failures) to provide emergency power to l

systems designed to mitigate the consequences of an 3 accident. ,

2) Generally, operation under the provisions of an action statement is permitted for limited periods of '

! time as it is recognized that single-failure criteria may not be-met during such operation. IP believes that operation with only DG1B out of ,

service for a period of time; longer-than normally  ;

l- allowed but within the noted limit constitutes no significant increase in risk regarding the-safe, ,

operation of the facility.

3) In addition, IP doesonot believe that the.present i situation should require subjecting the plant to an u unnecessary shutdown. Although there is a.certain

- risk associated with the increased allowed out-of- ,

service time, most challenges.to plant systems occur during startup and shutdown events. Eliminating'the ,

risk associated _with these events by preve.. ting an 1 unnecessary-plant shutdown due to the current action time limit is viewed to have a positive'effect on  ;

plant safety.

4) With respect ~to executing a safe shutdown.of the plant if required, the plant design is such that-safe shutdown to a cold condition can be-achieved with DGlB inoperable, particularly in view of the operability of all redundant power sources and the operable status of systems important to safety.

According to 10CFR50.92, a proposed change to the license-(Technical Specifications) involves'no'significant hazards consideration if operation:of the facility in

• accordance with the proposed change would not: (1) involve a significant increase in the probability or _

consequences of an accident previously evaluated, or (2) -

create the. possibility of a newLor different kind of

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-Attachm2nt 1-to U-601698 page-7 of 8 l

accident from any accident previously evaluated, or-(3)- l involve a significant reduction in a margin of safety. 1 The proposed changes are evaluated against each of-these  ;

criteria below.

1) As noted above, the proposed one-time request would permit DG1B (and only DGlB)- to be out-of-service for a longer period of time than normally allowed by the:

Technical Specifications. However,.in view of the operability of all other required on-site sources and all required off-site sources, IP believes that the proposed request does not constitute a sianificant increase in risk with respect.to the .

capability of safety systems to mitigate:the i consequences of an accident.- Additionally, then proposed request would permit a reasonable amount of time to restore'the DG1B heat exchangers to a.like- 3 new condition while avoiding an: unnecessary plant - i shutdown and potential challenges to safety-systems.

)

. Therefore, the proposed request does not-involve a i significant increase in probability or consequences q of any accident previously evaluated.- i

2) The proposed raquest does not involve any_ changes to ,

the design or operation of the: plant.- Since no new 1 failure modes are effected by the proposed; request, the proposed request does not create the possibility of a new or different kind of accident from any t

accident previously evaluated.

3) Under the proposed request, the allowedLout-of-service time for DG1B (although longer than normally allowed) would still be limited to a reasonable period of-time. With DG1A and DGlc operable, 'the l proposed change does not involve a'significant reduction in the margin of safety normally ensured by the Technical Specifications with-respect to the availability of' emergency onsite AC sources.

Concludina Remarks It should be noted that the current MIC problem could be resolved through a number or options. As noted previously, the diesel generator is not rendered inoperable by the MIC condition since the DG.could  :

perform its intended function with flow from the service l water system through the leaks within the heat exchanger. 1 One possible (but unrealistic) option would-be to. simply I continue operation with the heat exchanger "as-is." 1 Another option would be to plug the leaking tubes in lieu of replacing them. Neither of.these options, however, '

would be effective in mitigating the MIC condition or- j preventing a potential near-term future need to again address degradation of the DGlB heat exchanger-tubes due to MIC.

t "

Attachmsnt'l to U-601698- ,

Page 8 of 8

-The third option _is to replace the heat exchanger tubes. '

This.can restore either or both heat-exchangers to a like-new condition as IP pursues its long-term solution ,

to the_MIC problem. Ip feels that this is the appropriate course of action. The proposed request would ,

support complete replacement of-the tubes:in'both-heat  ;

exchangersL(for the 12-cylinder and 16-cylinder engines),

thus precluding the possibility of having to again remove. .

.the DG from service in order to plug;more tubes, '

l reassessing the impact of further plugging,'and- _

l potentially readdressing the MIC problem. Plant and grid conditions are:such that now is an appropriate time to [

request a waiver.of compliance in order to implement a i complete and thorough (short-term) fix to the MIC problem for DG1B. ,

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, A'ttachment 2 3/4.8 ELEC?RICAL POUER SYSTEMS to U-601698 i 3/4.8.1 AC SOURCES AC S2;lRCES - OPERATING ,

LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following AC electrical power sources shall bc l OPERABLE:

a. Two physically independent circuits between the offsite transmission network and the onsite. Class IE distribution system, and I b. Three separate and independent diesel generators, each with:

1. A separate day fuel tank containing a. minimum of 385 gallons of fuel for diesel generators 1A and 18 and 240 gallons of fuel for diesel generator 10.

2. A separate fuel storage system containing a minimum of 48,000 gal-lons of fuel for diesel generator 1A and 45 l generator 18 and 29,500 gallons of fuel for,000 gallons for diesel generator IC. diesel

3. A separate fuel transfer pump.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

a. With one offsite circuit of the above required AC electrical power sources inoperable demonstrate the OPERABILITY of the remaining AC sources by performlng Surveillance Requirement 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If either diesel generator-1A or 1B has not been successfull tested within the ast 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> demon-strate its OPERABILITY by perfo n Surveillance Req frements 4.8.,1.1.2.a.4 and 4.8.1.'1.2.a.5 for each such die el generator, separately, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 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 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. .

b. With either diesel generator 1A or 18 inoperable, demonstrate the OPERABIL-ITY of the above required AC offsite sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at' least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If the diesel generator became inoperable due to any cause other than preplanned preventive maintenance or testing, demonstrate the OPERABILITY of the remainin OPERABLE diesel generators, separately, by perfonning Surveillance Req f rements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />". Restore the inoperable diesel generator to OPERABLE

• This test is required to be completed regardless of when the inoperable diesel generator is restored to OPERABLE status. The provisions of Specification 3.0.2 are not applicable.

CLINTON - UNIT 1 3/4 8-1 Amendment No. 13 )

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Attachment 2' to U- 601698 Page 2 of 3

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. ELECTRICAL Pok!W SYSTEMS

. .m - * .  ;

AC $00RCES - OPERAffR0 .

9 LIMITING . CONDITION FOR OPERATION (Continued)  !

t 3.8.L1 ACTION (Continued): .-

y status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in 4t'least HOT SHUT 00WN within theinext 12' tours and in COLD SHUTOOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.' * ,

c. With one offsite circuit of the above-required' AC sources and diesel i generator 1A or 18 of the above required AC electr.ical power sources inoperable, demonstrate the OPERABILITY of .the resalning AC sources by- }

perfoming Surveillance Requirement 4.8.L1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least  !

j

- once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereaf ter. If.a diesel generator became inoperable from  !

any cause other than preplanned preventive maintenance or testing, deson-i strate the OPERABILITY of the remaining CPERABLE diesel generators, i

separately, by perfoming Surveillance Requirements 4.8.1.L2.a.4 and. *

! Restore at least one of the inoperable AC '

4.8.L L 2.a.5 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *.

i sourcas to CPERABLE status within 12. hours on be in.at least HOT SHUT 00WN i 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 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 6

' Restore at least two offsite circuits and diesel generators IA and 18 to CPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of-initial loss or be in at I 1*att 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 i

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

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d. With diesel generator 1C of the above required AC electrical power sources

• i inoperable, cesonstrate the OPERABILITY .cf the offsite AC sources by per-

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f feming Surveillance Requirement 4.8.L1.1.4 within 1 hout and at least i once per 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> thereafter. If the diesel generator became incperable as +

a result of any cause other than preplanned preventive saintenance or testing, demonstrate the OPERASILITY of the remaining OPERASLE diesel gener-ators, separately, by.perfort:ing Surveillance Requirements 4.8.1.L2.a.4  !

and 4.8.1.1.2.4.5 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />". Restore diesel generator 1C to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or declare t!)e HPCS systen it.y.;cle and -

j take the ACTION required by Specifications 3.5.1 and 3.7.1.1. i o

e. With diesel generitor 1A or 1B of the above required AC electrical power

• sources, inoperable, in addition to taking ACTION b or c, as applicable.

verify within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that all required systems, subsystems, trains, c:=ponents and devices that de:end on the remaining OPERASLE diesel  ;

generator as a sour:e of emergency power are also CPERA8LE: .otherwise, be in at least HOT SHUT 00WN 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 00VH within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. ,

f.

• 'iui

= teth cf' tha at:va required of fsite circuits inoperab1'e. , demonstrate the OPERABILITY cf three diesel generators, separately, by performing Surveillance Requirements 4.8.1.1.2.a,4 and 4.8.1.L2.a.5 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> i unless the diesel generators are alreacy operating. Restare at least one is test is recukrte to be c:=pleted re;srdless of when the incperable closel  ;

generator is r:st: red to CPERASILITY. The provisions of Spectf.ication 3.0.2 3 are not appit:1:le.

CLIh'iOH - UNIT 1 3/4 6 2 3 e

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6 Attachmept,f to U-60169P .

Page 3 of I l

ELECTRICAL POWER SYSTEMS .

AC SOURCES - OPERATING ,

t LIMITING CONDITION FOR OPERATION (Continued)  !

3.8.1.'1' ACTION (Continued): -

r E of the above-required offsite circuits to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> i

.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 />. With only one  ;

offsite circuit restored to OPERABLE status, restore at least +.wo offsite i

circuits to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss 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 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.. A successful test (s) of diesel generator .

. 0PERABILITY per Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5, .

performed under this ACTION statement for the OPERABLE diesel generators, satisfies the diesel generator test requirements of ACTION statement,a. ,

g. With diesel generators 1A and'1B of the above-required AC electrical power

')

sources inoperable, demonstrate the OPERA 8ILITY of the remaining AC -

sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> -!

) and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter and Surveillance Require- i*

ments 4.8.1.1.2.a.4 and 4.8.1.1.2.a.S for diesel generator 10 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.* Restore at least one of the inoperablo diesel generators 1A and IB to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 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 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. - l Restor'e both diesel generators 1A and 18 to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> i j from time of initial loss 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 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />,

h. With one offsite circuit of the above-required AC electrical power sources _

inoperable and diesel generator 1C inoperable, apply the requirements of .

. ACTION statements a and d specified above. -. .-.

i. With either diesel generator 1A or 1B inoperable and diesel generator.

1C inoperable, apply the requirements cf ACTION statements b, d and e-specified above. ,

l i

• This test is required to be completed regardless of when the inoperable diesel .

generator is restored to OPERABILITY. The provisions of Specification 3.0.2 are not applicable.

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