ML20147C870

Identifies Sys Which Are Req to Assure Adequate Core Cooling, & Specifies Operability Conditions That Must Be Met by Each Sys

ML20147C870
Person / Time
Site:	Vallecitos File:GEH Hitachi icon.png
Issue date:	01/09/1978
From:	Baer R Office of Nuclear Reactor Regulation
To:	Shao L Office of Nuclear Reactor Regulation
References
NUDOCS 7812180428
Download: ML20147C870 (3)

Text

. __ - . _ ., . . _ _ _ . - _ _ _ _ _ _ _ _ _ _ _ - - - . _ _

e N ve .

f 'a ,$d UNITED STATES NUCLEAR REGULATORY COMMISSION d .b ), WASHINGTON, D. C. 20555

?o, E

% ','[}. * ' JAN 0 91978

j. MEMORANDUM FOR: Lawrence Shao,-Chief, Engineering Branch, D0R Fl!0M: Robert L. Baer, Chief, Reactor Safety Branch, D0R

SUBJECT:

GETR EMERGENCY COOLING SEISMIC QUALITY ,

t

The Reactor Safety Branch has reviewed the GETR emergency cooling systems and identified those systems that are required to assure adequate cooling of the core. The enclosure identifies these systems

~

and specifies the operability conditions that must be met by each system. We request that the Engineering Branch examine the seismic qualifications of the components listed in the enclosure and identify any which do not satisfy the required operability conditions.

kkf f. ?A"1 Robert L. Baer, Chief Reactor Safety Branch Division of Operating Reactors

Enclosure:

As stated cc: V. Stello D. Eisenhut A.Schwencer/

F. Burger C. Berlinger.

F. Coffman S. Weiss G. Lanik i

18321804 78 f) -

GETR ESSENTIAL SYSTEMS The GETR emergency cooling systems are designed such that during a seismic evert all active valve realignments are accomplished during the low magnitude initial shoc'. and p. .or to the advent of large accelera-tions. The seismic trip is initiated at an acceleration of 0.01 g. The control rods begin co drop into the core 530 msec after the initial shock and the emergency cooling valves are fully open by that time. The primary system is fully depressurized at 1 sec after the initial shock.

The flow control valves on the proposed fuel flooding system are also opened upon receipt of the seismic scram signal.

The following sections list the components of the GETR system which are required to assure that the core is adequately cooled following a design basis failure and simultaneous seismic event. It is assumed that the main seismic event is preceeded by a relatively low magnitude initial shock.

A. Passive components that must not fail during a seismic event.

1. Reactor pool and liner

2. Primary system main piping and standpipes

3. Bottom head penetrations 4 Fuel flooding system piping and taris

5. Fuel storage canal and liner

6. Fuel storage tanks

7. Polar crane restraints i

B. Components that must operate actively during the initial low magnitude tremor and must not fail passively during the main shock.

1. Emergency cooling valves PRI 130 and PRI 150

2. Fuel flooding system flow control valves C. Components that must remain operable following the rain shock. .

I

1. Primary cooling check valves PRI 140 and PRI 160

2. Anti siphon valves PRI 190 and PRI 191 l

3. Fuel flooding system check valves l

4. Fuel flooding system anti siphon devices