ML20004D310
| ML20004D310 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/03/1981 |
| From: | Maine Yankee |
| To: | |
| Shared Package | |
| ML20004D304 | List: |
| References | |
| NUDOCS 8106090142 | |
| Download: ML20004D310 (8) | |
Text
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3.19 SAFET'l INJECTION SYSTIM Applicability:
Applies to the condition of safety injection system.
l Chiective:
'Ib define the condition of the safety injection system required daring reactor operation.
t Specification:
a)
None of the folloting valves may be closed unless the reactor is suberitical:
1.
Any safety injection tank isolation valve (SIA-M-11, i
21, 31) 2.
Any safety injection header isolation valve (HSI-16, 26, 36) t 3.
Any loop isolation valve (RCM-11,12, 21, 22, 31, 32) b) Se reactor shall not be critical unless the following conditions are met
- k r
1.
We breakers shall be racked out and tagged open for the safety injection tank isolation valves, the power leads shall be renoved from the breakers, the bare metal terminal ends tamd, and the breakers locked out.
2.
The breakers for the loop isolation valves:
(a)
Shall be opened, and padlocked in the open position.
(b)
% e breaker thermal overload links shall be 3
physically removed from the breakers.
(c)
An entry describing the above action shall be placed in the Shift Supervisor's Iog Book.
j Exception: Breakers for loop isolation valves RC-M-21 and RC-M-22 need not be opened and padlocked and the thermal overload links for these valves need not be Iflysically removed during the period between May 5, 1981 ed May 9, 1981.
3.
The following EOG check valves shall have been determined to be intact in accordance with Technical
- Specification 4.6.A.2(f).
EI-17 (27, 37) -
EI-61 (62, 63)
ISI 12 (22, 32)
Basis:
%e position restrictions on the loop isolation valves, safety injection header isolation valves, and the safety injection tank isolation valves are necessary to assure that plant opera"lon is restricted to conditions considered in the loss-of-coolant accident analysis.
810609o N 3.19-1
The emoeption with respect to valves RC-M-21 and RC-M-22 ensures that 1000 two can be isolated rapidly follcwing a postulated plant Mown necessitated by degradation at the loop two reactor coolant p q seals.
The restrictions on the E003 check valves are necessary to assure that two barriers between interfacing systems are maintained during plant operation.
i 3.19-2
- 4. 6 PERIODIC TESTING SAET.TY INJECf]DN NO CDN' rail @ENT SPRAY SYS'ITNS S'IFJM GENERA'IOR AUXILIARY FEED PLMPS MAIN STEPM EXCESS FION GECX VALVES Applicability: Applies to the safety injection system, the containment spray system, chemical injection system, the containment cooling system, the auxiliary feedwater system, and the main steam 4
excess flow dieck valves.
Objective:
'Ib verify that the subject systems will respond promptly and perform their intended functions, if reqaired.
Specification:
A.
SAETfY LTECf]DN NO CDNTAIPMENT SPRAY SYS'IfMS 1.
'Ihe follwing tests will be performed monthly whenever plant conditions are as defined in Section 3.6.A of these Specifications.
a.
Bnergency Core Cooling System (ECG) pumps:
Both operable high pressure safety injection (HPSI) punps shall be tested by operating in the charging mode.
Both operable low pressure safety injection (LPSI) punps and both operable containment spray (G) pmps shall be tested by operating in the recirculation node.
Acceptable performance shall be that pmps attain rated heads, operate for at least 15 minutes, and that the associated instrmentation md controls function properly.
b.
ECIS Valves:
All automatically operated valves that are required to operate to assure core flooding, or containment spray shall be exercised.
The volume control tank (NCr) outlet to charging pump suction valves shall be exercised through part travel and all other valves shall be visually checked to verify proper operating position.
2.
The following tests will be performed at each refueling interval:
a.
ECG Pumps:
One HPSI pump shall be flow tested at 1000 psig discharge head.
I One LPSI pmp md one G pmp shall be flow tested at 100 psi discharge head.
During these tests flow distribution thru the HPSI and LPSI flow orifices will be checked.
Acceptable performance shall be that the punps and orifices attain flow values used in the safety analysis.
4.6-1
Alternate pumps will be tested at each refueling interval, so that all punps will be tested within any five year period.
b.
EOG Valves:
All autoiaatically operated valves and the notor operated fill header root valves shall be exercised through their full travel in conjunction with the actuation signal testing set forth in Table 4.1-2 of Technical Specifications.
c.
Safety Injection Tanks:
Each safety injection tank will be flow tested by opening the tank isolation valve sufficient to verify check valve operation.
d.
The correct position of each electrical and mechanical position stop for the following throttle valves shall be verified:
- 1) Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following' conpletion of maintenance on the valve when the HPSI system is required to be operable.
- 2) At least once per 4 nonths Valve Nunbers IEl-M-ll IEI-M-12 IEI-M-21 IEI-M-22 IEI-M-31 IEI-M-32 e.
A flow balance test, as described an 4.6.A.2 above, shall be performed during shutdown to confian the injection flow rates assumed in the Safety Analysis following completion of HPSI or LPSI system modifications that alter system flow characteristics.
f.
E03 Check Valves
'Ihe leakage flow shall be determined to verify the integrity of -*
the following check valves:
IEI-17 ISI-12 IEI-27 ISI-22 IEI-37 ISI-32 IEI-61 IEI-62 IEI-63 The IBI 17, (27, 37) and IEI 61 (62, 63; check valves shall be determined to be intact if the accunulated flow through both valves in series is less than or equal to 15 gpn.
The ISI-12 (22, 32) check valve shall be determined to be intact if
- the leakage flow is less than or equal to 15 gpm.
4.6-2
3.
The containment spray flow nozzles win be tested every five years.
%e test will consist of pressurizing the headers with air and verifying that the nozzles are free of obstruction.
4.
Containment Isolation Valves:
Where practicable, each containment isolation valve shall be stroked to the position required to fulfin its safety function every three months. Those valves that cannot be tested without possible adverse effects during plant operation shall be tested during each cold shutdown if not tested during the previous three nonths.
s B.
STEAM GDERA'IOR AUXILIARY FEED PtNPS Prior to plant startup fonowing an extended cold shutdown, a flow test win be performed to verify the normal flow path from the denineralized water storage tank to the steam generators. The flow test will be conducted with the AEW system valves in their normal alignment.
Monthly inspections shall be performed to verify that au manual valre9 in the AEW system necessary to assure flow from the primary water source to the steam generators are locked in the proper position.
During normal plant operation, each auxiliary feed pump shall be tested at quarterly intervals to demonstrate operability of punps, system valves md instrtznentation.
C.
MAIN STEAM EXCESS ETOW CHEQ( VALVES he main steam excess flow check valves shan be tested once every 6 weeks for movement of the valve disc through a distance of approximtely one md one-half inches. Wese valves win be tested through fun travel distance'during each refueling interval.
Basis:
The safety injection system and the containment spray system are principal pimt safeguards systems that are normany operable during reactor operation.
Conplete system tests cannot be performed when the reactor is operating became of their inter-relation with operating systems. We method of assuring operability of these systems is a conbination of conplete system tests performed during refueling shutdowns md monthly tests of active system conponents (pumps and valves) which can be performed during reactor operation. We test interval is based on the judgment that more frequent testing would not significantly increase the reliability (i.e.,
the probability that the ccaponent would operate when required), yet more frequent tests would result in increased wear over a long period of time.
%e monthly part travel exercising of the VCT outlet to charging ptrnp
. suction valves, in lieu of the fun travel exercise, is conducted to preclude m interruption of normal plant operations. Redundant valves i
have been used to assure proper lineup in the event of ECG actuation.
4.6-3
Other E03 valves whose operation is not required to assure core flooding or containment spray shan be tested during each refueling shutdown period in accordance with 2.b.
The inspection of the leakage flow through the EOG check valves during each refueling re&ces the concern that one valve failure cut of two check valves in series may go undetected for an indefinite period of time. Wis ensures that two barriers between interfacing systens are maintained during plant operation.
We leakage flow of 15'gpm through the ECCS check valves is sman enough
- to mintain integrity of the valves and is also small enough to allow measurement mder the testing program.
Verification that the spray piping and nozzles are open win be made initiany by a suitably sensitive method, md at least every five years thereafter. Since au piping material is an stainless steel, normally in a dry condition, md with no plug 31ng mechanism available, the retest every five years is considered to be are than adequate.
Other systems that are importmt to the emergency cooling function are the SI tanks, the conponet cooling system and the service water system.
We SI tanks are a passive safety feature.
In accordance with the Specification 4.1 (Table 4.1-2, Item 11), the water volume and pressure in the SI tanks are checked periodically. Se ccznponent cooling and service water system operate when the reactor is in operation and are continously monitored for satisfactory performance.
The three nonth testing interval of the steam generator auxiliary feed pmps verifies their operability by recirculating water to the demineralized watsr tank.
Prior to plant startup fonowing an extended cold shutdown, a flow test is performed on the Auxiliary Feedwater System to functionally verify the system alignment from the demineralized water storage tank to the steam generators.
Monthly inspections are performed to verify that au manual valves in the Auxiliary Feedwater System from the primary water source to the steam generators are locked in the proper position.
Proper functioning of the steam turbine admission valve and starting of the auxiliary feed punp will denonstrate the operability of the steam driven pm p.
Verification of correct operation win be made both from instrtznentation with the main control room and direct visual observation of the pumps.
The main steam, excess flow check valves serve to limit an excessive reactor coolant system cooldown rate and resultat reactivity insertion following a min stem break incident. Their freedom to move will be verified periodically.
4.6-4
Specification 3.19 (Alternative)
- 3.19 - SAFEM INJECTlDN SYSTEM Applicability:
Applies to the condition of safety injection system.
. Objective:
'Ib define the' condition of the safety injection system required.chring reactor operation.
Specification:.. a)
None of.the following valves may be closed unless the reactor is subcritical:
1.
Any safety injection tank isolation valva (SIA-M-ll, 21, 31) 2.
Any safety injection header isolation valve (HSI d, 26, 36) 3.
Any loop isolaidon valve (R(M-ll, 12, 21, 22, 31, 32) b) he reactor shall not be critical unless the following conditions are met:
i 1.
The safety injection tank isolation valves shall be disabled in the open position. his shall require the following:
[
a.
We breakers shall be locked and tagged open.
t I
b.
We disconnect switches for each valve power operator shall be locked and tagged open.
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2.
The loop isolation valves shall be disabled in the open position. This shall require the following:
I a.
We brmkers shall be locked and tagged open.
b.
We discomect saitches for each valve power t
operator shall be locked and tagged open.
s 3.
he following ECG check valves shall have been determined to be intact in acx:ordance with Technical
- t Specification 4.6. A. 2(f).
EI-17 (27, 37) mI-61 (62, 63) l ISI 12 (22, 32) i Basis:
he position restrictions on the loop isolation valves, safety injection header isolation valves, and the safety
[
injection tank isolation val'.res are necessary to assure that plant operation is restricted to conditions considered in the r
loss-of-coolant accident analysis.
he restrictions on the ECG check valves are necessary to assure that two barriers between interfacing systems are maintained during plant operation.
i 3.19-1
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