ML19312B866

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Proposed Tech Specs 3.14,4.1 & 4.18 Re Hydraulic Shock Suppressors
ML19312B866
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 02/19/1976
From:
DUKE POWER CO.
To:
Shared Package
ML19312B861 List:
References
NUDOCS 7911250065
Download: ML19312B866 (16)


Text

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3*.14 . h'YDRAULIC SHOCK SUPPRESSORS Applicability Applies to all modes of operation except cold shutdown and refueling shut-down.

Objective To assure piping integrity in the event of a severe transient or seismic disturbance.

Specification 3.14.1 Except as permitted by 3.14.2 and 3.14.3, the reactor shall not be heated above 200 F unless all hydraulic shock suppressors listed in Table 4.18-1 are operable.

3.14.2 If a hydraulic shock suppressor is determined to be inoperable, continued operation is permitted for a period not to exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, unless the suppressor is sooner made operable.

3.14.3 If the requirements of 3.14.1 and 3.14.2 cannot be met, the reactor shall be in a cold shutdown condition within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

Bases Suppressors are designed to prevent unrestrained pipe mocidn under dynamic loads as might occur during an earthquake or severe transient, while allowing normal thermal motion during startup and shutdown. The consequence of an inoperable suppressor is an increase in the probability of structural damage to piping as a result of a seismic or other event initiating dynamic loads.

It is therefore required that all hydraulic suppressors required to protect the primary coclant system or any other safety system or component be operable during reactor operation.

Since the suppressor protection is required only during relatively low probability events, a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed for repairs or replace-ments. In case a shutdown is required, the allowance of 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> to reach a cold shutdown condition will permit an orderly shutdown consistent with standard operating procedures. Since plant startup should not commence with knowingly defective safety-related equipment, Specification 3.14.1 prohibits startup with inoperable suppressors.

7911 250 3.14-1

Table 4.1-2

, MINIMUM EQUIPMENT TEST FREQUENCY Item Test Frequency

1. Control Rod Movement Movement of Each Rod Bi-Weekly
2. Pressurizer Safety Valves Setpoint 50% Annually
3. Main Steam Safety Valves Setpoint 25% Annually

. 4. Refueling System Interlocks Functional Prior to Refueling l1

5. Main Steam Stop' Valves Movement of Each Stop Monthly i Valve
6. Reactor Coolant System ( } Evaluate Daily Leakage
7. Condenser Cooling Water Functional Annually 4

System Gravity Flow Test

8. High Pressure Service Water Functional Monthly Pumps and Power Supplies j , 9. Spent Fuel Cooling System Functional Prior to

' Refueling q

i (1) Applicable only when the reactor is critical.

1

( ) Applicable only when the reactor coolant is above 210 F and at a steady-state temperature and pressure.

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.4.1-9 1

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. g 4.18 HYDRAULIC -SHOCK SUPPRESSORS Applicability Applies to hydraulic shock suppressors used to protect the Reactor Coolant System or other safety-related systems.

Obj ective To verify that required hydraulic shock suppressors are operable. 1 Specification All hydraulic shock suppressors listed in Table 4.18-1 shall be visually inspected. This inspection shall include as a minimum, hydraulic fluid 3

reservoir, fluid connections, and linkage connections to the piping and anchor to verify suppressor operability in accordance with the following schedule:

Number of Suppressors Found Next Required

! Inoperable During Last Inspection Inspection Interval 0 18 months i 25%

1 12 months i 25%

2 6 months + 25%

I 3,4 4 months 1 25%

5,6,7 2 months i 25%

18 1 month 1 25%

Note: (1) The required inspection interval shall not be

lengthened more than one step per inspection.

Note: (2) Suppressors may be catagorized in two groups,

" accessible" or " inaccessible", based on their accessibility during reactor operation. These two groups may be inspected independently according to the above schedule.

Bases All safety-related hyraulic suppressors are visually inspected for overall

, integrity and operability. The inspection will include verification of proper-orientation, adequate hydraulic fluid level and proper attachment of suppressor to piping structures.

The inspection frequency is based upon maintaining a constant level of suppressor protection. Thus, the required inspection interval varies inversely with the observed suppressor failures. The number of inoperable suppressors found during a required inspection determines the time interval for the next required inspection. Inspections performed before that intervcl l . has elapsed may be used as a new reference po2 nt to determine the next i 4.18-1

~

~. -

ihspection. However,,the results of such early inspections performed before the original required time interyc1 has elapsed may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.

1 1

1 1

4.18-2 l

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3-1318 . X 3-1319 l X 3-1320 X

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