ML19095A059
| ML19095A059 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/23/1977 |
| From: | Stallings C Virginia Electric & Power Co (VEPCO) |
| To: | Reid R, Rusche B Office of Nuclear Reactor Regulation |
| References | |
| Download: ML19095A059 (12) | |
Text
'.
e
- e.
VIRGINIA ELECTRIC AND PowER COMPANY HIOHMOND,ViROINI~- 23261 March 23, 1977
.. ~gu\\atory Docket fi\\G Mr. Benard C. Rusche, Director Office of Nuclear Reactor Regulation Attention:
Mr. Robert W. Reid, Chief Operating Reactors Branch No. 4 Division of Operating Reactors Uw S. Nuclear Regulatory Commission Washi_ngton, D. C.
205_55
Dear Mr. Rusche:
Serial No. 124 LQA/DWSj r: krb Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 Amendment to the Operating License Technical Specificati6n Change No. 50
- Surry Power Station Units 1 and 2 Pursuant to 10 CFR 50.90, the Virginia Electric and Power Company hereby requests an amendment to Operating licenses DPR~32 and DPR-37 for Surry Power Station Unit Nos. 1 and 2.
- The amendment requested is a change td the Technical Specifications and has been designated as Change No. 50.
Specifications 3.2.B.6 and 3.2.C.6 do not allow outage time to perform repairs to the Boron Injection Tank (BIT) recirculation flow path.
Therefore, a change is being requested which would permit brief two hour periods of no f16w in order to perform maintenance.
Furthermore, rather than modify specification 3.2.B.6 and 3.2.C.6, we are requesting that these specifications be deleted and that the requirements for recirculation be more appropriately added to the Limiting Conditions for Operati"on of the Safety Injection System..
The basic design of the Boron Injection Tank will ensure that it will.retain its full capabilities while isolated for a short period of time (two hours).
BIT heaters normally maintain temperatures in the tank in the range of 170°F.
This provides assurance that the boric acid solution in the tank is maintained and monitored well above the 145°F solubility limit for a 13% solution.
In addition, the tank-is well insulated which should preclude any local "cold spots" for boron precipitation.
Also, the tank will remain full for the duration of its isol~tion since the BIT is located below the Boric Acid tanks and would be the low point in the system.
e e
V1H01NIA ELECTRIC AND POWER COMPANY TO Mr. Benard C. Rusche Attached are the proposed changes which have been reviewed by both the Station and System Nuclear Safety and Operating Conmittees.
Further, it has been determined that these changes do not involve an unreviewed safety question as defined in 10 CFR 50.59.
- Attachments cc:
Mr. Norman C. Moseley Very truly yours,.
(j). Jl?.,\\ft;{ li.'.t-~y:J C. M. Stal 1 ings Vice President-Power Supply and Production Operations 2
/.
e e
'(SEAL)
Attest:
D. A.
COMMONWEALTH OF VIRGINIA
)
)
S.S.
- CITY OF RICHMOND
)
Before me, Robert M. Neil, a Notary Public, in and for.. the City and Commonwealth aforesaid, on this 23rd day of March,. 1977*,: personnally appeared C. M. Stallings and D. A. Hillsman, Jr., who.being duly sworn, made oath and said (1) that they are Vice President - Power Supply and Production Operations and Assistant Secretary, respectively, of the Virginia Electric and Power Company,_ (2). that they are duly authorized to execute and file the foregoing Amendment in.behalf of that Company, and (3) that the statements i~ the Amendment are true to the *best of their knowledge and belief~
Given under my hand and notarial seal this 23rd day of March, 1977.
My.Commission expires January 20, 1981.
- /&~/#~;£-
Robert M. Neil Notary Public (SEAL)
TS 3.2-i 3.2 CfiEMICAL AND VOLUME CONTROL SYSTEM Applicability Applies to the operational.status of the Chemical and Volume Control System~
Objective To define those conditions of the Chemical and Volume Control System necessary to ensure safe reactor operation.
Specification.
A.
When fuel is in a reactor there shall be at least one flow path to the core for boric acid injection.
The minimtm1 capability for boric acid injection shall be equivalent to that supplied from the refueling water storage tank.
B.
For one unit operation the reactor shall not be critical unless the following Chemical and Voltm1e Control System conditions are met:
- 1.
Two charging pumps shall be operable.
- 2.
Two boric acid transfer pumps shall be operable.
- 3.
The boric acid tanks (tank associated with the unit plus the common tank) together shall contain a minimum of 4200 gallons of at least 11.5% (but not greater than 13%) by weight boric acid solution at a temperature of at least 145°F.
/
e e
TS 3.2-2
- 4.
System piping and valves shall be operable to the extent of establishing two flow paths to the core; one flow path from the boric acid tanks to the charging pumps and a flow path from the refueling water storage tank to the charging pumps.
- 5.
Two channels of heat tracing shall be operable for the flow paths requiring heat tracing.
- 6.
Delete.
C.
For two unit operation the reactor shall not be critical unless the following Chemical and Volume Control System conditions are met:
- 1.
Two charging pumps shall be operabl~ per unit.
- 2.
Three boric acid transfer pumps* shall be operable.
- 3.
When the common tank is in service, it shall be assigned to only one unit at a time.
For that unit which has usage of the common tank, the boric acid tapks (unit's tank plus common tank) together shall contain a minimum of 4200 gallons of at least 11.5% (but not.greater than 13%) by weight boric acid solution at a temperature of at least 145oF.
For that unit which does not have usage of the common tank, the unit's own tank shall contain a minimum of 4200 gallons of at
.. least 11.5% (but not greater than 13%) by weight boric acid solution at a temperature of at le.ast 145°F.
When the common tank is assigned to one unit, valves shall be positioned to establish a flow path to that unit and prevent flow to the other unit.
- -;-~ 1
r
~.
- 4.
System piping and valves shall be operable to the extent of establishing two flow paths to the core; one flow path from the boric acid tanks to the charging pumps and a flow path from the refueling water storage tank.to the charging pumps.
- 5.
Two channels of heat tracing shall be operable for the flow paths requiring heat tracing.
- 6.
Delete D.
The requirements of Specifications Band C above may be modified to allow one.of the following components to be inoperable at any one time.
If the system is not restored within the time period specified, the reactor shall be placed in the hGt shutdown conditions.
If the requirements of Specification 3.2.B and Care not satisfied within an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the reactor shall be placed in the cold shutdown condition.
- 1.
One.of the stipulated boric acid transfer pumps may be inoperable for a period not to exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided immediate attention is directed to making repairs.
- 2.
Two charging pumps may be inoperable subject to the provisions of Specification 3.3-B.
- 3.
One heat tracing circuit may be inoperable for a period not to exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided immediate attention is directed to making repairs.
r
-r e
Basis
~
Tne Chemical and Volume Control System provides control of the Reactor Cbolant System Boron inventory.
This is normally accomplished by using boric acid transfer pumps which discharge to the suction of each unit's charging pumps.
The Chemical and Volume Control System contains four boric acid transfer pumps.
Two of these pumps are normally assigned to each unit but valving and piping arrangements allow pumps to be shared such that 3 out of 4 pumps can service either unit.
An alternative (not normally used) method of boration is to use the charging pumps taking suction directly from the refueling water storage tank.
There are two sources of borated water available to the suction of the charging pumps through two different paths, one from the refueling water storage tank and one from the discharge of the boric acid transfer pumps.
A.
The boric acid transfer pumps can deliver the boric acid tank contents (11.5% solution of boric acid) to the charging pumps.
B.
The charging pumps can take suction from the volume control tank, the boric acid transfer pumps and the refueling water storage tank.
Reference is made to Technical Specification 3.3.
The quantity of boric acid in storage from either the boric acid tanks or the refueling water storage tank is sufficient to borate the reactor coolant in order to reach cold shutdown at any time during core life.
Approximately 4200 gallons of the 11.5% solution of boric acid are required to meet cold shutdown conditions.
Thus, a minimum of 4200 gallons in the boric acid tank is specified.
An upper concentration limit of 13% boric acid in the
r TS 3.2-5 e
e tank is specified to maintain solution solubility at. the specified low temperature limit of 145°F.
For redundancy, two channels of heat tracing are installed on lines normally containing concentrated boric acid solution.
(Delete}
The Boric Acid Tank(s), which are locate4 above the Boron Injection Tank(s),
are supplied with level alarms, which would annunciate if a leak in the
~
system occurred.
References
.FSAR Section 9.1 Chemical and Volume Control System
I" J.a:J J.--..:,-.i.
e*
e 3.3 SAFETY INJECTION SYSTEM Applicability Applies to the operating status of the Safety Injection System.
Objective To define those limiting conditions for operation that are necessary to provide sufficient borated cooling water to remove decay heat from the core in emergency situations.
Specifications A.
A reactor shall not be made critical unless the following conditions are met:
1~
The refueling water tank contains not less than-350,000 gal. of borated water with a boron concentration.of at least 2000 ppm.
- 2.
Each accumulator system is pressurized to at least 600 psia and con-tains a minimum of 1075 ft3 and a maximum of.1089 ft3 ~f borated water with a boron concentration of at least 1950 ppm.
- 3.
The boron injection tank and isolated portion of the inlet and outlet piping contains no less than 900 gallons of water with a boron concentration equivalent to at least 11.5% to 13% weight boric acid solution at a temperature of at least 145°F.
Additionally, recirculation between a unit's Boron Injection Tank and the Boric Acid Tank(s) assigned to the unit shall be maintained.
- 4.
Two channels of heat tracing shall be available for the flow paths.
- 5.
Two charging pumps are operable.
- 6.
Two low head safety injection pumps are operable.
- 7.
All valves, piping, and interlocks associated with the above com-ponents which are required to operate under accident conditions are operable *
. 8.
The Charging Pump Cooling Water Subsystem shall be operating as follows:
- a.
Make-up water from the* Component Cooling Water Subsystem shall be available.
- b.
Two charging pump component cooling water pumps and two charging pump service water pumps shall be ~perable~
- c.
Two charging pump intermediate seal coolers shall be operable.
e 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Prior to initiating repairs, all automatic valves in the redun-
~dant system shall be tested to demonstrate operability.
- 5.
One channel of heat tracing may be inoperable for a period not to exceed 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, provided immediate attention is directed to making repairs.
- 6.
One charging pump component cooling water pumps or one charging pump service water pump may be out of service provided the pump is restored to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
- 7.
One charging pump intermediate seal cooler. or other passive component may be out of service provided the system may still operate at 100 percent capa-city and repairs are completed within ~8 hours.
- 8.
Power may be restored.to any valve referenced in 3.3.A.9 and 3.3.A.10 for the purpose of valve testing or maintenance providing no more than one valve bas power restored and provided that testing and maintenance is completed and power removed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
- 9.
Power may be restored to any valve referenced in 3.3.A.ll for the purpose of valve testing or maintenance providing no more than one valve has power restored and provided that testing or maintenance is completed and power removed within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
- 10.
Recirculation between a unit's Boron Injection Tank and the Boric Acid Tank(s) assigned to the unit may be terminated for a period not to exceed two hours, provided all other parameters (temperatures, boron concentration, volume) of the Boron Injection Tank are within Speci_fications 3.3.A.3 and immediate attention is directed to making repairs.
1' Basis Cont
- e TS 3.3-9 e
The accumulators (one for each loop) discharge into the.cold legs of the reactor coolant pipirig when Reactor Coolant System pressure decreases below accumulator pressure, thus assuring rapid core cooling for large breaks.
The line from each accumulator is provided with a motorized valve to isolate the accumulator during reactor start-up and shutdown to preclude the discharge of the contents of the accumulator when not required.
These valves receive a signal to open when safety injection is initiated.
To assure that the accumulator valves satisfy the single failure criterion, they will be blocked open by de-energizing the valve motor operators. when the reactor coolant pressure exceeds 1000 psig.
The operating pressure of the Reactor Coolant System is 2235 psig and safety injection is initiated when this pressure drops to 650 psig.
De-energizing the motor operator when the pressure exceeds 1000 psig allows sufficient time during normal startup operation to perform the actions required to de-energize the valve.
This procedure will assure that there is an operable flow path from each accumulator to the Reactor Coolant System during power operation and that safety injection can be accom-plished.
The removal of power from the valves listed in the specification will assure that the systems of which they are a part satisfy the single failure criterion.
Continuous recirculation between the Boron Injection Tank and the Boric Acid Tank(s) ensures that a unit's Boron Injection Tank is full of concentrated boric acid at all times.