ML20118A302
| ML20118A302 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/24/1992 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML20118A299 | List: |
| References | |
| NUDOCS 9208280228 | |
| Download: ML20118A302 (2) | |
Text
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3.3.3 Exceptions to 3.3.2 shall be as follous:
a.
Both core flood tanks shall be operable at all times.
b.
Both the motor operated valves associated with the core flood 3
tanks shall be fully open at all times, c.
One reactor building cooling fan and associated cooling unit shall be permitted to be out-of-service for seven days.
3.3.4 Prior to initiating maintenance on any of the components, the duplicate (redundant) component shall be verified to be operable.
Bases The requirements of Specification 3.3.1 assure that, before the reactor can be made critical, adequate engineered safety features are operable. Two engineered safeguards makeup pumps, two decay heat removal pumps and two decay heat removal coolers (along with their respective cooling water systems components) are specified. However,.only one of each is necessary to supply emergency coolant to the reactor in the event of a loss-of-coolant accident.
Both core flooding tanks are required because a tingle core flooding tank has insufficient inventory to reflood the cort for hot and cold line breaks (Reference 1).
The operability of the borated water storage tank (BWST) as part of the ECCS ensures that a sufficient supply of ber ated water is available for injection by the ECCS in the event of a LOCA (Reference 2).
The limits on BWST minimum volume and boron concentration ensure that 1) sufficient water is available within containment to permit recirculation cooling flow to the core, and 2) the reaci.or will remain at least one percent subcritical at 70*F without any control rods in the core following mixing of the BWST and RM water volumes (Reference 3).
The contained water volume limit of 350,000 gallons includes an allowance for water not usable because of tank discharge location.
The limits on contained watcc volume, Na0H concentration and boron concentration ensure a pH value of s tween 8.5 and 11.0 of the solution sprayed within containment after a design basis accident.
The minimum pH of 8.5 assures that iodine will remain in solution while the maximum pH of 11.0 minimizes the potential for caustic damage to mechanical systems and components.
Redundant heaters maintain the borated water supply at a temperature greater than 40*F.
3-23 Amendment No. 149, 157 9208280228 920824 PDR ADOCK 05000289 P
PDR A
1 The post-accident reactor building emergency cooling may be accomplished by 4
three emergency cooling units, by two spray systems,'or by a combination of one emergency cooling unit and one spray system.
The specified requirements assure that the required post-accident components are available.
The iodine removal function of the reactor building spray system requires one spray pump and sodium hydroxide tank contents.
i The spray system utilities common suction lines with the decay heat removal i
system.
If a single train of equipment is removed from either system, the other train must ce assured to be operable in each system.
4 When the reactor is critical, maintenance is allowed per Specification 3.3.2 and 3.3.3 provided requirements in Specification 3.3.4 are met which assure 4
operability of the duplicate components. The specified maintenance times e
are a maximum. Operability of the specified components shall be based on the satisfactory completion of surveillance and inservice testing and inspection required by Technical Specification 4.2 and 4.5.
4 The allowable maintenance period of up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> may be utilized-if the operability of equipment redundant to that removed from service is verified based on the results of surveillance and inservice testmg and inspection required by Technical Specification 4.2 and 4.5.
I In the event that the need for emergency core cooling should occur, operation of one makeup pump, one decay heat removal pump, and both core flood tanks will protect the core.
In the event of a reactor coolant system rupture their operation will limit the peak clad temperature to less than 2,300*F and the metal-water reaction to that representing less than 1 percent of the clad.
{
Two nuclear service river water pumps and two nuclear service closed cycle cooling pumps are required for normal operation. The normal operating l
requirements are greater than the emergency requirements following a t
l oss-o f-cool ant.
REFERENCES i
l (1) UFSAR, Section 6.1
" Emergency Core Cooling System" (2) UFSAR, Section 14.2.2.3 "Large Break LOCA" (3) UFSAR, Section 14.2.2.1
" Fuel Handling Accident" i
1 i
3-24 Amendment No. 80, 149, 157