ML20071G108

Discusses Status of Open Item Re Subj Facil Protec Against Failures During long-term post-LOCA Period.Applicant Will Install Manually Actuated Pumpback Sys to Pump Water from Reactor Bldg Basement Floor Drain Sump to Suppression Pool

ML20071G108
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	12/08/1978
From:	Mills W Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
ML20071F735	List: ML20071F730 ML20071G062 ML20071G093 ML20071G108 ML20071G124 ML20071G170 ML20071G342 ML20071G406 ML20071G419 ML20071H202 ML20073E129 ML20073E163 ML20073E181
References
FOIA-93-375 NUDOCS 7812210062
Download: ML20071G108 (2)

Text

-

' */ y ' *.*

o l

Distribution Y

NRR Rdg.

I\\

RSD Rdg.

yills Chron.

DEC 8 W6 y, g3113 Docket No. 50-322 MEMORANDUM FOR:

T. M. Novak, Chief Reactor Systans Branch, DM TRU G. R. Mazetis, Section Leader. Reactor Sy',tems Branch, DSS

" ~

...., +..:

Y TROM:

W R. Mills Reactor safety Branch. 00R

SUBJECT:

$HORDM OPEN ITIM - PROTECTION AGAINST PASSIVE FAILURES DURING THE LO N-TERM POST-LOCA PERIOD One of the Shoreham open items relates to passive failure considerations during the long-tars post-LOCA period. The major factor in this open item 's that the Shoreham design dots not utilize watertight rooms to provide flood protection for the ECC5 pumps as do other BWR's.

In the Shoreham design, the ECC5 pumps are located in one large annular area surrounding the suppression pool enclosure in the reactor building basement. The Shoreham position is that this< annular area has sufftetent

[

wlume to prevent flooding of ECC$ equipment prior to detection and 4.(tastde the Rx. butidinalinvolves isolatini Ecc systems (g the leek

/fsolation of the source of leakage. The method of locatin trial-and-error

?

bests) and monitoring the level change in the suppression pool or reactor

. building fioor drain samp. s,t>.

A i

[

yv 4 C g4rp

. jj la response to staff

• consents on this method (see attached memo), the

[

j. agitcant has agreed to install a manually actuated 'pumpback" system Mich could pamp watet* ftga the reactor building basement floor drain f

i

, sump to the swpression pool. This system would further winisize the possibility of floodtog and reduce loss of inventory from the suppression pool. With the 'pumpback' s>1 tem and some additional todifications (e.g.,

1 solation of normal.susy pump discharge detection), it is expected tut Shoreham, and improved sensitivity of lea could satisfy R$5 requirements.

The RS8 general posit 1on es pesaive fallures.is described in a memorendum (April 26,1976) to R3B personnel.

f-t

i. e

}

5

(-

I*ge.g

. e c 'p s

\\

t.7 s

t r:

,c 7

Contact:

W1111asMill r

3 49-281722.....

4.

g gg gg g g gg gg

$g @

+6 h.

h

.N O$

N O

e 781221000% N f $

.. _ m.

s' A

e e

e T. M. Novak DEC 8 1978 4

Unless informed otherwise I will continue to pursue resolution of this issue on the basis that the Shorehan design (with "pumpback") will be acceptable if it is shown that R$8 requirements are met without the use of watertight rooms for E.CCS ptsnps, g.:gewor

..., g

~5 7

(.

,,c.; W..

)(1111am R. Mills

. i.i. 7,:

Reactor safety Branch

^. ' -

Ofvision tif'0persting Reactors cc R. Tedesco RSS Members inclosure Staff Connents nyyn::

. g.:

m'n'i;Mp;.1 1..' /;.

3. V l' *a 4Q

..e O

6

-r..

y.4

,)

".

• so.

• i,

...).,

.. g,; k *.k'

,.hr

~

wm * *.IIIf00D!#$B D11, p33.,4*

kd[

• * = '

• 4M41-

. &;; ' -.wnns w

.... -.1eans-

...t,_...-

l

.