ML18030A285
| ML18030A285 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 05/15/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| PLA-788, NUDOCS 8105190249 | |
| Download: ML18030A285 (3) | |
Text
~ ~
HEbuLAT lNl-ORHATION D IS TR I BU IT ION
'5 TEA (R IDS)
ACCESSION NoH:6105190209 VVC ~ DATE: 81/05/15 NOTARiZED:
NO FACIL:bn 307 Susquehanna Steam Electric Stationi Unit 1> Pennsylva 50-3b8 Susquehanna Steam Electric Station>
Unit 2> Pennsylva AUTH INANE AUTHVH Al F JLIATION CURT lSi I,'< ~
Pennsylvania Power 5 Light Co ~
RECIf NAiUit.,
HAEC IP IcN l AF F ILIATI ON YOUNGBLOOOiB.S.
Licensing Branch 1
SUBJECT:
Forwards response to SEH Outstanding issue 36iaavising that calculation of fission products w>ll not reach isolation valves if HSING-loop control sys operated for 30-s w/inhoard isolation valves opens OISTRISUTIUN COUE:
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TWO NORTH NINTH STREET, ALLENTOWN, PA. 1810l u~l 'I PHONEi l215l S21-5
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May 15, 1981 Mr. B. J.
Youngblood, Chief Licensing Branch No. 1 U.
S. Nuclear Regulatory Commission Washington, D.C.
20555 Docket Nos. 50-387..--
50-388 SUSQUEHANNA STEAM ELECTRIC STATION SER OUTSTANDING'SSUE 36 ER 100450 File 841-2 PLA-788
Dear Mr. Youngblood:
In response to SER Outstanding Issue 36, the attached calculation assures that the fission products will not reach the inboard isolation valves if the MSIV-LCS is operated for 30 seconds with the inboard isolation valves open.
This calculation completes our action on SER Outstanding Issue 36.
Very truly yours, P&
N.
W. Curtis Vice President - Engineering and Construction-Nuclear cc:
R. M. Stark - NRC qooI li PENNsYLYANIA PowER 8
L I GH T coMPANY
Per NRC request, the following calculations show that fission product is about half way down the main steam line betw'een the RPY and inboard MSIV.
This is relative to the LCS operation, coupled with an inboard h)SIV failed open, before it automatically shuts off in about 30 seconds.
Steam Line Data:
Steam line length from RPY no=".le to inboard ~ISIV = 89 ft (shortest of 4 steam lines, Ref.
Bechtel's FCI-P49-951 to 953)
Steam line si-e Sch 80,'pipe nominal ID Area Volume
= 26-inch (Ref.
761E250RE)
= 23.358" (Ref.
731E224)
= 2.975 ft2
= 265 ft~
~ihss of steam 6
50 psia
= 31.1 ibm. (saturated)
LCS D'ata:
Process line Line size Calculate mass of DP = 3.36 equivalent length < 150 ft (Ref. Bechtel's dra>>ing SK-~f-5288 to 5291) 2l1 steam released in 30 seco'nds through the 2-inch bio>>'do>>n line.
x 10 6 fl>>'2Y Icrane pg 3-2 a~
DP
= 35 psid f =.023 L= 150 ft V = 8.5 ft3/lb vg 8 50 psia d5
13.74 Sch 160 pipe 6P
6 x 10-6 x.023 x 150 x 4'2 x 8.5 13.74 35 x 13.74 3.36 x 10-6 x.023 x 150 x 8.5 lbs/hr
= 0.61 lbs/sec.
i~hss release in 30 sec
= 18.3 lbs vs.
31.1 lbs initially in the steam line.
Vote; The intial mass of 31. 1 ibm does not take into account steam mass bet>>een inboard and outboard MSIV's'.