ML19329C369
| ML19329C369 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/18/1977 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| TAC-08164, TAC-8164, NUDOCS 8002130734 | |
| Download: ML19329C369 (4) | |
Text
p. m~
-~ m.
M.
e' 1_
__ Docket File
~
i~ ~~ M7tT Ernst'~~ ~
NRC PDR W. P. Gammill
~
Local PDR ELD
R. S. Boyd D. Crutchfield R. C. DeYoung V. Stello s
Docket No. 50-346 D. B. Vassallo K. Goller F. J. Williams G. Lear J. Stolz J. Hannon Toledo Edison Company L. Engle W. Haass ATTN: Mr. Lowell E. Roe E. Hylton Vice President, Facilities R. J. Mattson Development D. Ross bcc: JRBuchanan, NSIC Edison Plaza J. P. Knight TBAbernathy, TIC 300 Madison Avenue R. Tedesco ACRS (16)
Toledo, Ohio 43652 H. Denton V. A. Moore Gentlemen:
R. H. Vollmer
SUBJECT:
PWR HPSI AND LPSI FLOW RESISTANCE - DAVIS-BESSE, UNIT 1 A large number of PWR High Pressure and Low Pressure Safety Injection Systems (HPSI anJ CLPSI) utilize a comon low pressure and a cocoon high pressure header to feed the several cold (and in some cases hot) leg injection points. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to:
(1) prevent total put::p flow from exceeding runout conditions when the system is in its minimum resistance configuration; (2) provide a i
proper ficw split between injection points in accordance with the assumptions used in the ECCS-LOCA-analyses; and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses. Many plants have either manual or motor operated valve (s) in the lines to each injection point that have electrical or me6anical stops which have been adjusted during pre-operational testil9 of the plant to ensure that these flow requirements-are satisfied.
In view of the safety function associated with the proper setting of valves used to throttle flow in these systems, we consider it appropriate that periodic verification be made of these valve positions. Accordingly, we request that you determine if throttle valves are used to obtain the required flow distribution in the.HPSI or LPSI systems.
If throttle valves are used, we request that you propose changes to your technical specifications to incorporate the surveillance requirements given in the enclosure.
1-]
In the event valves are not utilized to throt'tle flow in your systems, you should advise us of this fact and no further action will be required.
246 f v
~
~.
~
's p
+
N
. n. a Y
NE1"1N7_""a.
u.d (a%
.a_...m.
8 002} 30 93f f
.,y
=
-.g; '
oi 9
L..
,o Toledo Edison Company The above action should be completed within 60 days of receipt of this letter.
In the event you should desire further discussion of this matter, please contact us.
Sincerely, "QE$inal Signedlif JohnF.Stolz g John F. Stolz Chief Light Water Reactors Branch No.1 Division of Porject Management
Enclosure:
Technical Specifications cc w/ enclosure:
Mr. Donald H. Hauser Esq.
The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 Gerald Charncff Esq.
Shaw, Pittman, Potts and Trewbridge 1800 M Street. N. W.
'4ashington, D. C.
20036 Leslie Henry, Esq.
Fuller, Seney, Henry and Hodge 300 Madison Avenue Toledo, Ohio 43604
/
. nc.
- LWR O _WP_1 3
t _
Lsw K
_uessy _ w4n
=== =Jr> "== a== _ _ _ _
1*.._-_'-""-..__..___
)
\\
y, j
o x-4' ENCLOSURE
)
- c u..". '... v S a r.
. :.. c.n> s '. m..s. e. vo..
S e e.m.. 5"s:..~. r.. n..e.r. r.
a-PWR H?SI *!; LPS SYSTEM TMoiTTLE ViLVE STCPS position of each electrical and/or'me:hanical position ine corre::
- 1. 'stop for :ne fc11:aing nect:la valves shall be verified:
i Witnin 4 hcurs f 110 wing Ocmpletion of each valve stroking coeration - mainter.ance on the valve when the H?SI or LPSI a.
System is required :: be cperable.
i D.
At least once pe-13 months.
- i I
L?SI System HPS1 System Valve Num er Valve humber 1.
1.
2.
2.
w.
4 s.
4 1
5.
5.
balance test shall se cerforred during shutdcwn to confirm the j
A flew follo..in; minimum injection flew rates felicwing escoletion of EPS-2.
or L?SI system modifications nat alter system flow cnaracteristics:
L?SI System - Single Pemo HPSI Systec. - Single Puro Injecti:n ' eg 1
gpm Injection Leg 1 _,
_ gom spm Injectica Le; ____ 1 spm Infe::icn Leg Injec.ti:n Leg 1 __
spm Injection Leg
[
g;m gpm Inj ection Leg ____ 1 gpm Injectica Leg Bases The pur;ose of these surveillance requirements is to provice assurance :na: -
Maintenance pec;er E::S fl ws will be maintained in the event of a LCCA.
of prcper ficw resistance anc pressu-e drop in the piping system to ei
. injection point is necessary :c:runcut condi icns' wnen tne' system is in its (2) previce tne proper ficw split be: ween injection points in accordance with the assumpticas used in tne ECCS-LOCA analyses, and (3) provice an acceptable. level of total ECCS ficw to all injection points equal to or above snat assumec in tne ECCS-LCCA analyses.
9 e
9 e
e
-s.-
..m,..,
w
. - - +
9