ML19262A196
| ML19262A196 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/14/1974 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| GQL-0080, GQL-80, NUDOCS 7910260530 | |
| Download: ML19262A196 (5) | |
Text
AEC r Tg5"n C" FO? ?p ? 50 DCCKET W - 'I
- t.
(TDiPORARY FORM)
CONTROL NO:
5535 FILE:
FRCH:
DATE OF DOC DATE REC'D LTR TWX RPT CTHER Metropolitan Edison Company Reading, Pennsylvania 19603 R. C. Arnold 6-14-74 6-19-74 X
TO:
Mr. Giambusso 1 signed CLASS UNCI.AS S PROP I:20 INPUT NO CYS REC'D DOCKET NO:
XXXX 1
50-259 DESCRIPTION iCLCSURES:
Ltr submitting description of the Reactor Building Atmospheric Clean-Up System......
Do not R$lDOW DIST PER BERNERO ff)df}.
? n **
PLANT NAME:
Three Mile Island Unit # 1 FOR ACTIC:!/I!UC2'ATIC" 6-24-74 AB BUTLER (L) v"SCHWENCER (L)
ZIEMANN (L)
REGAN (E)
W/ CYS W/ 2 CYS W/ CYS W/ CYS CLARK (L)
STOLZ (L)
DICKER (E)
W/ CYS W/ CYS W/ CYS W/ CYS D&DQ /T\\
1FACCATTA /T \\
int T e wTmu / tl' \\
W/ CYS W/ CYS W/ CYS W/ CYS KNIEL (L)
PURPLE (L)
YOUNGBLOOD (E)
W/ CYs W/ CYS W/ CYS W/ CYS N
7 INTERNAL DISTRIBUTION o rG F "X TECH REVIEW DENTON LIC ASST A/T IND
/ AEC PDR HENDRIE GRIMES DIGGS (L)
BRAITMAN OGC SCHROEDER GAMMILL EARIN (L)
SALTZMAN MUNTZING/ STAFF MACCARY
/r:ASTNER GOULBOURNE (L)
B. HURT CASE KNIGHT BALLARD KREUTZER (E)
GIAMBUSSO PAWLICKI SPANGLER LEE (L)
PLA'iS BOYD SHA0 MAIGRET (L)
MCDONALD
/ MOORE (L)(LWR-2)
STELLO ENVIRO REED (E)
CHAPMAN
/ DEYOUNG (L)(LWR-1)
HOUSTCN MULLER SERVICE (L)
DUBE w/ input SKOVHOLT (L)
NOVAK DICKER SHEPPARD (L)
E. COUPE f 0LLER (L)
ROSS KNIGHTON SLATER (E)
P. COLLINS IPPOLITO YOUNGBLOOD SMITH (L)
D. THOMPSON (2)
DENISE TEDESCO
/ REGAN TEETS (L)
KLECKER REG OPR LONG
/ PROJECT MGR WILLIAMS (E)
EISENHUT f ILE & REGION (3)
LAINAS ST. MARY WILSON (L)
MORRIS M ENAR0YA HARLESS 1 AO7
') 1 d STEELE VOLLMER EXTERNAL DISTRIEUTION I 't U 0-g3
/ 1 - LOCAL PDR Harrisburt. Pa.
()
- 1 - TIC (A3ERNATHY)
(1)(2)(10)-NATICNAL LABS 1-PDR-SA'; /LA /NY
/ 1 - NSIC (BUCHAAN) 1-ASLBP(E/h Bid;, T.m 529) 1-1ROOKHAVE:; 3AI :_G 1 - ASLB 1-W. PENNINGTON, Rm E-201 GT 1-G. ULRIKSCN, CRNL
/ 1 - P. R. DAVIS 1-B&M SWINEBRCAD, Rm E-201 GT 1-AGMED (RUTH GUSSMA'.
/ 16 - ACRS M9kR1XS SENT TO LIC ASST.
1-CONSULTANTS Rm B-127 CT E. GOULBOURNE NE'.0 LARK / BLUMI' /AGBABIAN 1-RD..MUELLER, Rm F
^^
GT
- 7 910 2 6 033C)
~ ifs 4.sry g
/.V!.2 ! :
, w -... L e,i r
...s METROPOLITAN EDI5ON COMPANY T cecicE BcV 542 PE AOf NG. PE%';sVLV ANI A 15GC'l TELEPHONE 215 - % 9 7.01 June lh, 1974 GG C080
, g f, ' '
,W~
9 ja(/
s wb Y
.Q/ 'jI C f r,
[,j)
Mr. A. Gia= busse 6'
00CXETED t
/./t/
Deputy Director fcr Cperating Reacters U AEC 0
9 Directorate cf Licensing r'.1.
.l ';
U
- M t. 1 3 g ypj l 9 Jg /4 > -r Cffice of Ree ulaticn f,;i U. S. Atomic Energy Con =ission th pgu $ck [ /.-
Washingtcn, D. C.
205L5
/
r A
DccxtT cwtx l x
-. /x g
N,.. _ ;?.y,V
Dear Mr. Gia=tusso:
g
- ei_,
THREE MILE ISLA:iD :PJCLEAR STAaw.
U:IIT IIO.1 LICE:ISE 110. DPR-50 LCCEZT IIO. 50-269 During Mr. R. Bernero's visit to the Three Mile Island Unit 1 site in January, he requested a descriptien of the Reactor Building Atmospheric Clean-Up Syste=.
The description is provided as fellevs:
The purpose of the Reacter Building Atmospheric Clean-Up Syste (Kidney Syste ) is to reduce the airtcrne radicactivity level in the Reactor Building during nor=al cperaticn and the syste perferns no safety related functicn. The kidney syste= vill be ec=pletely installed in the Reacter Building during the first refueling shutdevn. This kidney syster is not safety related and therefere need meet cnly good standard indus-trial practices.
The kidney syste censists primarily of a filt,tr plenu=, a centri-fugal fan, and an internal water spray syste for fire prctection. The filter plenu is located en the Reactor Building's intermediate ficer level (elevation 308'-0") near the Reacter Cc=part=ent Cccling Syste fans (AH-E-2A, 23). Se banks of filters in the plenus are arranged as fc11cvs:
roughing, HEPA, charecal, HEPA. Each of these banks has an individual externally scunted differential pressure gage that indicates the pressure drop acrcss that bank. 2 e charcoal filter bank also has temperature senscrs (RTC's) to =cnitcr the bank temperature. The sensers are connected to a recorder that indicates and centinuously reccrds these temperatures.
In addition, temperature switches are strategically located in the charecal bank te start the water spray syster pumps in case cf excessive charecal tc perature.
The syster's fan is located at the cutlet frc the filter plenus en the intermediate ficcr level cf the Reacter Building. It is belt driven by a h0 H.P. electric =cter, and is rated to handle 20,200 A.C.F.M. at 110 F (13,CCC SCFM). Electric pcwer for the fan =cter is supplied frc:
C a ncn-class IE pcver scurce.
vQuQ
- - ~ Q ~
)h
~ ".
The system air flow pattern is arranged so that air is drawn from the R'eactor Building basement, (elevation 281'-0") via the purge supply system inlet duct.
The air then flows through the filter plenum before being freely discharged to the intermediate floor level space (elevation 308'-0")
through two opposed direction outlets located on the fan discharge connection.
The air in this space is in turn drawn into the Reactor Compartment Cooling System and the Reactor Building Recirculation System.
The Reactor Compart-ment Cooling System forces the air that it handles past the Reactor and up to the Reactor Building operating floor. The Reactor Building Recirculation System mixes the air from the intermediate level with return air from other areas in the Reactor Building and discharges it into the basement.
Here it is picked up by the Reactor Building supply fans for distribution throughout the building, and by the steam generator cocpartment cooling system fans for supply to the steam generator compartment. This air flow pattern for the Clean-Up System effectively eliminates possible recirculation around the system which might occur if it were to take its inlet air f*om the intermediate level and discharge it there also.
The water spray system used with the filter plenum is intended to prevent burning of the charcoal in the plenum's charcoal adsorber bank.
The spray system consists of a water storage tank, two pumps (one redundant),
spray nozzles in the filter plenum, and interconnecting piping, valves, fittings, etc.
It is a closed system in that water from the storage tank will return to the tank by gravity flow from the filter plenum for continuous recirculation. The amount of water vaporized to steam will be small since the system activates at 200*F (maximum) and the charcoal does not burn until an approximate 500*F temperature is reached. Since the system is closed, no dilution of the borated water in the Reactor Building sump will occur.
The storage tank and pumps are located in the Reactor Building basement (floor elevation 281'-0").
The tank is a nominal 1500 gallon capacity horizontal type suProrted on two saddles. Make-up water for the tank is manually controlled, with the water piped to the tank from the reclaimed water system in the Reactor Building. The tank may be nearly emptied by connecting a temporary line to the pump-out connection provided in the pump discharge piping and operating one of the system's pumps.
The residual water remaining in the tank may be drained using drain valves provided in the piping. The water to be disposed of may be routed anywhere the operating personnel desire.
If the water is not radioactive, it can be pumped wherever required for normal disposal. If the water is radioactive it must be pumped to the Reactor Building basement sump for appropriate processing.
The spray pumps are vertical inline centrifugals driven by direct-connected 5 H.P. electric motors. Power for the "A" and "B" pump motors is supplied from a non-class IE power source. Under deluge conditions, Lnc charcoal is sprayed at a rate of 0.75 GPM per charcoal tray.
For the total 108 trays, this requires a minimum total flow of 81 GPM, resulting in a design water flow for each punp cf 90 GPM.
The controls for the kidney system are primarily manually actuated, except for water spray of the charcoal which is automatic (tempe rature actuated).
System operation is from a local control panel located outside the Reactor Building near the personnel access hatch to the Reactor Building.
The system fan (AH-E-101) can be manually started and stopped from the local control panel. Also, it will automatically stop when the water spray pu=ps are actuated by high temperature in the charcoal bank. The water spray pumps (FS-P-5A, B) can be manually started (for test and storage tank pump-out purposes) and stopped from the panel. However, the pumps are interlocked so that they cannot be manually started when the fan is already running.
If running, the fan must be manually stopped. Additionally, the pumps will start automatically in the event any two of the temperature switches located in the charcoal filter bank are actuated by high temperature.
The pumps must then be manually stopped.
Resistance Temperature Detectors (RTD's) are installed in the charcoal adsorber bank to allow continuous readout of the temperatures of the bank.
The five RTD's installed are monitored by an indicator-recorder mounted in the H&V panel in the main control room. The recorder has an alarm function associated with it that is actuated should the temperature of any one of the RTD's exceed 170*F.
This alarm is indicated on the H&V panel in the main control room, and also relayed back to the local panel for indication there. No actuation of the water spray system is done using the RTD's.
Fif teen temperature actuated switches are located in the charcoal adsorber bank. These switches are used to actuate the water spray system for the charcoal in case the temperature in the charcoal continues to rise af ter the high temperature alarm via the RTD's is given.
The set point of the switches is 200*F.
The switches are wired so that when any two switches t:?t, the water spray pumps are started and the filter fan is stopped.
It is aet up this way because should one switch malfunction and trip the pumps by itssif, an unnecessa.y cleanup expense would be incurred. However, in case of excessive teuperature at least two switches would trip in rapid successien.
An air fica switch is located in the inlet duct to the filter plenum.
It is used to detect abnormally low air flow rates through the system.
If low air flow is detected while the fan is running, an alarm is actuated on the local panel and in the main control room. Low flow could be caused by a malfunction of the fan, fan motor, fan drive. filter elements or ductwork.
The kidney system has several malfunction alarms associated with its operation. These are indicated on the local control panel and/or the main control room H&V panel as described below. The local control panel has warning lights for the following:
a.
One light for high charcoal temperature as sensed by the RTD's.
b.
One light for high charcoal temperature as sensed by the temperature switches.
c.
One light for low air flow.
\\h0
The H&V panel in the main control room has both visual and audible warnings via the panel's annunciator for the following:
a.
One window for high charcoal temperature (actuated by either the RTD's or the temperature switches).
b.
One window for low air flow.
In addition, the local control panel has " red-green" running lights for each motor (total of three) in the system.
Very truly yours, R. C. Arnold Vice President asb cc:
R. Eernero U.S. Atcmic Energy Commissien Washington, DC 205h5 1482 218