ML20199F451

Proposed Tech Specs Pages Re Amend to License NPF-42, Revising TS 3/4.7.5 by Adding New Action Statement Requiring Verification of Operability of Two RHR Trains,Or Initiation of Power Reduction with Only One RHR Train Operable

ML20199F451
Person / Time
Site:	Wolf Creek
Issue date:	01/12/1999
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20199F448	List: ML20199F441 ML20199F451
References
NUDOCS 9901210318
Download: ML20199F451 (11)

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Attach:nent IV to WO 99-0001 Page 2 of 3 i)LANT SYSTEMS 4

3/4.7.5 ULTIMATE HEAT SINK LIMITING CONDITION FOR OPERATION ,

3.7.5 The ultimate heat sink (UHS) shall be OPERABLE with:

a. The crest of the UHS dam below the rip rap cover and corresponding water level at or abmfa elevation 1070 Mean Sea Level, USGS datum and

b. The plant inlet water temperattre of less than or equal to 90'F.

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

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SURVEILLANCE REQUIREMENTS I i

4.7.5 The UHS shall be determined OPERABLE:

a. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the above required water temperature and water level to be within their limits, and

b. At least once per 12 months by verifying that the crest of the UHS dam below the rip rap cover is at or above elevation 1070 Mean Sea Level, USGS datum.

WOLF CREEK - UNIT 1 3/4 7-13 9901210318 990112 PDR ADOCK 05000482 P PDR

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Attachment IV to WO 99-0001 Page 3 of 3 INSERT A ACTinN:

a. With the plant inlet water temperature greater than 90*F, but less than or equal to 94*F:

1. Verify at least once per hour that the plant inlet water temperature is  !

less than or equal to 94*F, and i

2. Verify within one hour that two RHR trains are OPERABLE, or Reduce THERMAL POWER at least 5% from RATED THERMAL POWER for

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i each 1*F of plant inlet water temperature in excess of 90*F within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after each temperature verification, and

3. Restore plant inlet water temperature to less than or equal to 90*F within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. i

b. With the requirements of Action a. not satisfied or the UHS inoperable for any reason other than temperature, 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 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 />.

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Attachment V to WO 99-0001

. Page 1 of 8 ATTACIDENT V PROPOSED TECHNICAL SPECIFICATION CHANGES .

IMPROVED TECHNICAL SPECIFICATIONS

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UHS 3.7.9 3.7 PLANT SYSTEMS 3.7.9 Ultimate Heat Sink (VHS) l LCO 3.7.9 The UHS shall be OPERABLE.

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

ACTIONS l' ColOITION REQUIRED ACTION COMPLETION TIME A pe 1e. A.1 Be MODE 3 6M s

! A.2 Be i MODE . g)ita i

l SURVEILLANCE RE0VIREMENTS SURVEILLANCE FREQUENCY l

SR 3.7.9.1 Verify water level of UHS is a 1070 ft 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> linean sea level. ,

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SR 3.7.9.2 Verify plant inlet water temperature of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> UHS is s 90'F.

1 WCGS ITS 3.7-22 5/15/97

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A. Plant inlet water A.1 Verify plant inlet Once per 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> temperature not within water temperature s limit. 94=F.

AND A.2.1 Verify two RHR trains 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> OPERABLE.

28 A.2.2 Reduce THERMAL POWER One hour after at least 5% from RATED each temperature THERMAL POWER for each verification l'F plant inlet water temperature exceeds the limit.

AND A.3 Restore plant inlet 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> water temperature to within limit.

B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associate Completion Time of Condition A AND not met.

B.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> QB UHS inoperable for reasons other than Condition A.

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UHS B 3.7.9 4

B 3.7 PLANT SYSTEHS B 3.7.9 Ultimate Heat Sink (UHS)

BASES BACKGROUND The UHS provides a heat sink for processing and operating heat from safety related components during and following a transient or accident or a plant cooldown using only safety grade equipment. This is done by utilizing the Essential Service Water System (ESW) and the Component Cooling Water (CCW) System.

The VHS is the normally submerged seismic Category I cooling pond. The UHS is formed by providing a volume of cooling water behind a Seismic Category I dam built in one finger of the main cooling lake. The two principal functions of the UHS are the dissipation of residual heat after reactor shutdown, and dissipation of residual heat after an accident.

The basic performance requirements are that a 30 day supply of water be available, and that the design basis temperatures of safety related equipment not be exceeded.

Additional information on the design and operation of the system, along with a list of components served, can be found in Reference 1.

APPLICABLE The UHS is the sink for heat removed from the reactor core SAFETY ANALYSES following all accidents and anticipated operational occurrences in which the unit is cooled down and placed on residual heat removal (RHR) operation. Its maximum post accident heat load occurs after a design basis loss of coolant accident (LOCA) when the unit switches from injection to recirculation and the containment cooling systems and RHR are required to remove the core decay heat.

The operating limits are based on conservative heat transfer analyses for the worst case LOCA. Reference 1 provides the details of the assumptions used in the analysis, which include worst expected meteorological conditions, conservative uncertainties when calculating decay heat, and (continued)

WCGS ITS BASES B 3.7 50 5/15/97

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UHS B 3.7.9 BASES APPLICABLE worst case single active failure (e.g., single failure of a SAFETY ANALYSES manmade structure). The UHS is designed in accordance with (continued) Regulatory Guide 1.27 (Ref. 2), which requires a 30 day supply of cooling water in the UHS.

GuMM _

The UHS satisfies Criterion 3 of 10 CFR 50.36 (c)(2)(ii).

LCO The UHS is required to be OPERABLE and is considered OPERABLE if it contains a sufficient volume of water at or below the maximum temperature that would allow the ESW system to operate for at least 30 days following the design basis LOCA without exceeding the maximum design temperature of the equipment served by the ESW system. To meet this condition, the UHS temperature should not exceed 90*F and the level should not fall below 1070 ft mean sea ing normal unit operation.

APPLICABILITY In H0 DES 1. 2. 3. and 4. the UHS is required to support the OPERABILITY of the equipment serviced by the VHS and required to be OPERABLE in these MODES.

In H0DE 5 or 6. the OPERABILITY requirements of the UHS are determined by the systems it supports.

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ACTIONS (1#mer*3h gi Zs]

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> Fo ater eve s w 10 ft L. 't t b( .

lac in a E- whi the 0 do n ap f io acnieve luSERT D this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

The allowed Completion Times are reasonable, based on operating experience. to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.

(continued)

WCGS ITS BASES B 3.7 51 5/15/97

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INSERT A For a normal plant design cooldown, assuming both RHR trains are in service and a 90 F ESW temperature, the plant can be cooled down to cold shutdown conditions (200 F) within approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after reactor shutdown.

However, for the single RHR train operation, the calculated cooldown time increases to about 32 hours3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br />.

l INSERT B The UHS may continue to provide its safety function for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when the plant inlet water temperature is between 90*F and 94'F, providing the water level is at least 1070 ft MSL, and either both RHR trains are OPERABLE or power level is reduced 5% for every 1 degree that the inlet water temperature exceeds 90'F, up to a maximum inlet water temperature of 94*F.

INSERT C A.1 i

With plant inlet water temperature not within limit, the plant may continue to i operate for up 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, provided in'st water temperature does not exceed 94*F and the Required Actions are taken. Required Action A.1 verifies hourly that the plant inlet water temperature is less than 94'F.

A.2.1 and A.2.2 Required Action A.2.1 requires verifying that two RHR trains are OPERABLE. If two RHR trains are OPERABLE, plant operation at full power may be continued with plant inlet water temperature between 90 F and 94 F for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

The effect of increasing the plant inlet water temperature from 90 F to 94 F causes the calculated RHR cooldown time to increase. For cooldown operation using two RHR trains, the increase in cooldown time is insignificant and no power reduction would be necessary for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

With plant inlet water temperature exceeding its limit and only one RHR train OPERABLE, Required Action A.2.2 requires a power level reduction of 5% RTP for each l'F by which temperature exceeds 90 F. The calculated cooldown time for a single RHR train operation with an elevated plant inlet water temperature may exceed the 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> to achieve MODE 5. The extent of power reduction is determined based on a sensitivity study which considers a reduced power level prior to reactor trip in conjunction with an elevated plant inlet water temperature ranging from 91'F to 94 F. The power reduction ensures the single RHR train cooling capacity would be adequate to meet the shutdown time requirements. (Ref. 3).

A.3 Required Action A.3 requires plant inlet water temperature be restored to 90 F or less within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> limit represents a low risk significance based on the probability of main dam failure in conjunction with a postulated design basis LOCA being very low during the 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when the inlet water temperature is above 90 F. If the diurnal effects restores inlet water temperature to 90 F or less within the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> period the actions may be exited. This cycle may be repeated as long as the inlet water temperature is restored to 90 F or less. However, the plant cannot be operated at reduced power indefinitely if the inlet water temperature remains above 90'F for an extended period of time. This is due to the fact that all LOCA-related calculations are based on an UHS temperature of 95 F.

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1NSERT D If the UHS inlet water temperature cannot be returned to OPERABLE status within the associated Completion Time or the UHS is inoperable for reasons other than Condition A, the plant must be brought to a MODE in which the LCO does not. apply.

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UHS B 3.7.9 i

BASES (centinued) 1 SURVEILLANCE SR 3.7.9.1 REQUIREMENTS

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This SR verifies ttat adequate long term (30 day) cooling can be  !

maintained. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency is based on operating experience related to trending of the parameter variations during the applicable MODES. This SR verifies that the UHS water level l 1s a 1070 ft mean sea level (USGS datum).

SR 3.7.9.2 I l

This SR verifies that the ESW system is available to cool the CCW System to at least its maximum design temperature with the maximum accident or normal design heat loads for 30 days following a Design Basis Accident. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency is based on operating experience related to trending of the parameter variations during the applicable MODES. This SR verifies that the average water temperature of the UHS is s 90'F.

REFERENCES 1. USAR. Section 9.2.5.

2. Regulatory Guide 1.27. " Ultimate Heat Sink".

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3. Calc.aldib SAG /FSE-C-SAF-o290, W M F l

C ree.k. Redu.c.act Po- Ceo ldom R.er.,"

sof nslee.

j WCGS ITS BASES B 3.7 52 5/15/97

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Attachment V1 to 170 99-0001 Page 1 of 1 l

LIST OF COMMITMENTS 4

• l The following table identifies those actions committed to by Wolf Creek i Nuclear Operating Corporation (WCNOC) in this document. Any other statements l in this submittal are provided for information purposes and are not considered j to be commitments. Please direct questions regarding these commitments to Mr. l Michael J. Angus, Manager Licensing and Corrective Action at Wolf Creek l Generating Station, (316) 364-4077. J COMMITMENT Due Date/?, vent The amendment will be implemented within 30 days of July 15, 1999 l NRC approval.

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