ML20134L302
| ML20134L302 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/23/1985 |
| From: | Ainger K COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 0546K, 546K, NUDOCS 8509030187 | |
| Download: ML20134L302 (6) | |
Text
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x ' Commonwealth Edison
) one First Nationti Plaza, Chicigo. Ilhnois
-' ~J Address Reply to: Post Office Box 767 (y Chicago Illinois 60690 August 23, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Byron Station Unit 1 Environmental Effects of High Energy Line Breaks NRC-Docket No. 50-454 Reference (a): August 2, 1985 letter from K. A.
Ainger to H. R. Denton
Dear Mr. Denton:
Reference (a) provided details of the design of the temperature monitoring system to detect and isolate high energy line breaks in the Steam Generator Blowdown (SD) and Auxiliary Steam (AS) systems. This is to inform you of minor field changes to the modifications described in reference (a) and to advise you of the status of.the installation of these modifications for Byron Unit 1.
~
Equipment interference problems have prevented the installation of some of the temperature sensors in locations as originally described in reference (a).- The revised locations of these sensors are shown on the attached figures. The relocation of these sensors does not reduce their effectiveness to promptly detect the adverse environmental conditions associated with high energy line breaks in the SD and AS systems.
The installation of these modifications is near completion.
However, receipt of some of the temperature sensors was delayed beyond originally scheduled delivery dates from the vendor. This delay along with the time required to perform the functional testing of the equipment may extend completion of the modification beyond August 31, 1985. Every available hour is being worked to complete the modifications and manpower has been increased to help compensate for delays. We expect to have the modifications complete no later than September 30, 1985.
I 8509030187 850823 PDR ADOCK 05000454 p
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H. R. Denton August 23, 1985 We will continue to keep personnel posted at designated locations in the Auxiliary Building so that line breaks can be promptly detected and terminated manually before environnental conditions exceed predicted values.
Please direct any questions regarding this matter to this office.
One signed original and fifteen copies of this letter and attachment are provided for NRC review.
Very truly yours,
/
K. A. Ainger Nuclear Licensing Administrator 1m Attachment cc: Byron Resident Inspector 0546K i'
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w T FIGURE.1C STEAM GENERATOR BLOWDOWN SYSTEM HELB MONITORING h
h-(UNIT 1 ) ~~~ -
73-6 l
(1 SDO1EB 3)
'(1 SDO1 E A 3)
(1 SDO1 ED 3
1SDO1EC 3)
OSDO1F 6) i / / I / t -1r- (( r I I , 4.l*- Ei Il
- 0 k {, g.
r
- bjo^j;k 2-t1iI l
. 66 1111 d d iIil t ^ A3OO [ A301 A304 ~ 3 I A302 A305 A303 (1SDO1LA 14 h 5 s ETS .h gE! R ETS E g g 4- ?-).l. TS M --gh (1SD01LB 14) J- ,i TS n EE l ETS j.I *"*-gTS LEGEN D~. P CA FOR l'dRES G q BLOWDOWN a. L CONDENSER {- . TEMPERATURE '. SENSOR 1SDO1A g TUN NEL, ; AUX. HIGH ENE'RGY LINE BREAK NO. EL.364'- O~ ARM BLDG. ( )LINE IDENTIFICATION i
l' FIGURE 2C -l AUX. STEAM SYSTEM RELB MONITORING (UNITS 1 &2) E s 22 23 (AS TUNNEL AT COL M-23) 24 6'.- O. 21-3 i r ., Y s *.' .V. Y.- <' id t'.*. - 'a.p g g ey.. ,5 ~ N 1 n (O AS 33C - 6) = i (O AS 3OC - 4) ? l 1 i g (OAS 03F -16) ll M i i TS t
- Le?.
i . t.' 9'
- .* s a
.. g %:~. -
- r..' r e i
,. -(,, TS '. V 4 O BOTTOM TUNNEL EL. 394'-O" A020 n, '/, a g -{ fd a .J i
- i' $.s's6 f. v gli
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AOO7
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t.,'.'..*.- s:,o" s j L i j l ~ I ( AO13
- P Gs LEGEND:
SAME AS FIGURE iC ~ i i I i
'~ J' . FIGURE 2D AUXILIARY STEAM SYSTEM HELB MONITORING (UNITS I&2) Q $.? t?. (RECYCLE Wh5TE EVAPORATOR ROOMS) i fAOO51 2 l Ct; 4 J I s *; n _ Y O SO3KB-6} (OASF6AAY (OASO3.KA 6 (OASF6AB-Il@) m /4 b ~p c (OASO3LA 4) OASF5Ag3 ) (OASO3LB-4 / j LEGEND rP
- )
r-0 SAME AS ( OAS35AB-2 (OAS35AA-2) k_ i FIGURE IC (OAS35AO3h y ^^ AOO4 ^ ^ ,u - -u i U-N i \\ SUE UBE SL8 TUBE ^5 EVAP. N
- n. _-.
EVAP. OABO2DA ~OABO2DB u EVAR u EVAP. COND. \\ COND. i \\ i u U ~ o \\ f s i w h kv h N i v (OAS 36 BA-O 3/ OASF7AB 3/4) (OASF5AA3$- U l IA0015 (OAS36AB-l ) .__i y% J g r AOO3 I LOAS O4BB-2[ .l 3 -( 36 i e =r: w x'x ym* 2 - S TS ETS t m, -J _t x TS E TS E \\4 D Iil l hoop l COASO4AA-2) ~*' - Is (OAS36C-18/ h l kOASO4C-3) ^ I 7-6~
- f i 7' 6~
EL346'-O ~ (OA596A-103
FIGURE 2E Q ! h AUXILIARY STEAM SYSTEM HELB MONITORING (UNITS 1&2) AUXILIARY STEAM (RADWASTE EVAP. ROOMS) f 7 3'- 6
- 1:
8 0 ' (OWXY9AB 20) ~T BTS E TS E TS M TS E TS i ?>- (OAS32AA 10 (OAS3 2 AB 10 (OAS29A
- 10) g' j
--f4-- -fh-N 2AO10 2AOO8 4-N VAPOR BODY t U TANK OWXO7DC U 2AOO9 g 6 _~9 G_N,g c;n I k N X N h 2A614 T 3 VAPOR VAPOR v 3 3 O BODY TANK v_ BODY TANK qs - 2A012 (0, O qs X OWXO7DA OWXO7DB-[ ' 2A623 X i* 3 x -f$IO 'x Q g -Sh O ~ T 3A604 .o/ 2A624 / l 2A606 r._ . /~ 2 A618 4 ' 2A600 s. _a 2A615 2 A 619 ~ k [ 2A609 jh 2A 605 l 2A620 ~T I l. 3 I -2A622 2A601 -d i F-2A610 i s ~ ^ 2A 611 2 A613 e 2A 602 [ PUMP f A 03 A612 2AO11 PUMP PUMP OWX31PA ( HEATING OWX31PB . Q HEATING OWX31PC . [ HEATING ELEMENT ELEMENT ELEMENT i (OWX113 AC 18 ~OWXO6DC I OWXO6EA OWXO6DB j \\- \\ ~ (OWX113 AA 18 (OWX113 AB 18) EMPERATURE SENSORS PROTECTING THESE AREAS i LEGEND EL 414'-O' ALSO PROTECT AREAS SHOWN ON FIG. 2F (4Ol*-O T' SAME AS FIG.1C}}