ML20053C797

Proposed Tech Spec Change Requiring That Min cross-sectional Area Be Maintained Below Min Depths

ML20053C797
Person / Time
Site:	Crystal River
Issue date:	05/26/1982
From:	FLORIDA POWER CORP.
To:
Shared Package
ML20053C796	List: ML20053C795 ML20053C797
References
NUDOCS 8206020571
Download: ML20053C797 (4)

Text

l TECHNICAL SPECIFICATION CHANGE REQUEST NO. 96 Replace pages 3/4 7-18 and B 3/4 7-4 with 3/4 7-18 and B 3/4 7-4 provided.

Insert new page 3/4 7-18a.

Proposed Change

1) Change Limiting Condition for Operation 3.7.5.1.c to read: " Minimum cross-sectional areas of the intake canal as shown in Figure 3.7-1."

2) Revise Action 3.7.5.1.b to read: "With the cross-sectional areas of the intake canal less than the minimum indicated by Figure 3.7-1, restore the intake canal to at least the minimum limits within 90 days or be in at least HOT STANDY within 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 />."

3) Change Surveillance Requirement 4.7.5.1.b to read: "At least once per 24 months by determining that the cross-sectional areas of the intake canal are within the minimum limits indicated by Figure 3.7-1."

4) Revise Basis 3.4.7.5 to read: "The limitations on minimum water level, maximum temperature and cross-sectional areas ensure that.....".

Reason for Proposed Change The present Technical Specifications require that the intake canal bottom elevation be less than or equal to 74 feet Plant Datum. This requirement is overly restrictive and will require more frequent dredging than is necessary to assure the minimum required flow.

Safety Evaluation Plant safety will not be compromised. Current Technical Specifications require only that the channel depth be maintained below a maximum elevation. The proposed change requires that a minimum cross-sectional area be maintained below minimum depths. Analyses by Florida Power Corporation's Architect Engineer have shown that minimum flow requirements can be met, under normal and severe conditions, through maintaining the intake canal cross-sectional areas as specified in proposed Figure 3.7-1.

820602057/

PLANT SYSTEMS 3/4.7.5 ULTIMATE HEAT SINK LIMITING CONDITION FOR OPERATION 3.7.5.1 The ultimate heat sink shall be OPERABLE with:

a. A minimum water level at or above elevation 81 feet Plant Datum.

b. An inlet water temperature of .s1050F, and

c. Minimum cross-sectional areas of the intake canal as shown in Figure 3.7-1.

APPLICABILITY: MODES 1,2, 3 and 4.

ACTION:

a. With the water level -= 81 feet Plant Datum or the inlet water temperature := 1050F, be in at least HOT STANDBY within 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 />.

b. With the cross-sectional area of the intake canalless than the minimum indicated by Figure 3.7-1, restore the canal to at ' east minimum limits within 90 days or be ir. at least HOT STANDBY within 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 REQUIREMENTS 4.7.5.1 The ultimate heat sink 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 inlet water temperature and water level to be within their limits, and

b. At least once per 24 months by determining that the cross-sectional areas of the intake canal are within the minimum limits as indicated by Figure 3.7-1.

CRYSTAL RIVER UNIT 3 3/4 7-18

i .

PLANT SYSTEMS Br

..cA WATER SYSTEM

_ tRABILITY of the sea water system ensures that sufficient cooling capability is

...alable for continued operation of safety related equipment during normal and accident conditions. The redundant cooling capacity of this system, assuming a single failure, is consistent with the assumptions used in the safety analyses.

3/4.7.5 ULTIMATE HEAT SINK The limitations on the ultimate heat sink level, temperature and cross sectional areas ensure that sufficient cooling capacity is available to either 1) provide normal cooldown of the facility, or 2) to mitigate the effects of accident conditions within acceptable limits.

The limitations on minimum water level, maximum temperature and cross-sectional areas are based on providing a 30 day cooling water supply to safety related equipment without exceeding their design basis temperature and is consistent with the recommendations of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Plants", March 1974.

3/4.7.6 FLOOD PROTECTION The ACTION to be taken in the event of flood together with a Hurricane Warning ensures that the facility will be placed in a safe condition. The limit of evaluation 98 feet Plant Datum is based on the maximum elevation at which facility flood control measures provide protection to safety related equipment.

3/4.7.7 CONTROL ROOM EMERGENCY VENTILATION SYSTEM The OPERABILITY of the control room emergency ventilation system ensures that 1) the j ambient a.r temperature does not exceed the allowable temperature for continuous duty 7

l rating for the equipment and instrumentation cooled by this sytem and 2) the control room will remain habitable for operations personnel during and following all credible accident conditions. The control room emergency ventilation system is not required to maintain a positive pressure. The safety analysis of the system assumed slight in-leakage to the control l room which would be subsequently removed by the full recirculation flow. The i OPERABILITY of this sytem in conjunction with control room design provisions is based on limiting the radiation exposure to personnel occupying the control room to 5 rem or less whole body, or its equivalent. This limitation is consistent with the requirements of General Design Criterion 19 of Appendix "A",10CFR50.

l l

CRYSTAL RIVER - UNIT 3 B 3/4 7-4 i

l L

9 e

s r-2

" 6.6 mi = =

• 2.8 mi. =

N O.3 mi. = = a 008 mi. =

a 9

unit unit

! \

2 1 un;,

u GULF Q

225 15 0' COAST 300' f 133 v / "

D% h u A B = = C

= D

'k 7

if A - The cross--sectional area below elevation 79.0 feet must be at least 729 square feet B - The cross-sectional area below elevation 79.0 feet must be at least 504 square feet C - The cross-sectional area below elevation 73.7 feet must be at least 300 square feet

• D - The cross-sectional area below elevation 73.7 feet must be at least 133 square feet

• Assuming a constant 300 foot width MINIMUM CROSS-SECTIONAL AREA OF THE INTAKE CANAL FIGURE 3.7-1

__ _ __ _-_ __ _--