ML20238E917
| ML20238E917 | |
| Person / Time | |
|---|---|
| Site: | 05000134 |
| Issue date: | 09/10/1987 |
| From: | WORCESTER POLYTECHNIC INSTITUTE, WORCESTER, MA |
| To: | |
| Shared Package | |
| ML20238E910 | List: |
| References | |
| NUDOCS 8709150291 | |
| Download: ML20238E917 (2) | |
Text
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T.
ep 2.0 ' SAFETY LIMITS AND'0PERATING RESTRICTIONS 2.1 Safety Limits Criticality: The' reactor shall be subcritical when the three control blades are at their fully 1:ithdrawn positions and the regulating blade is in its. fully inserted position.
Shutdown Mergin: The minimum shutdown margin under any condition with the
, highest worth control blade fully withdrawn shall be no less than 1% Ak/k.
9 6 Magnet Release and Blade Drop Times: The interval between the occurrence of cutoff voltage (scram) and the separation of each control blade from its
- .F, - magnet shall not exceed 100 msec. Total time of insertion of the first 24 in, of the control _ blades following initiation of a scram signal shall be
[ce t less than 600 msec, including the magnet release time.
F1 Maximum Excess Reactivity: The maximum excess reactivity above cold, clean, critical shall be 0.5% Ak/k.
Radiation Alarms: Upon indication of radiation levels in excess of 50 mrems/hr (20 mrems/hr for fuel storage) area rianitors shall actuate audible
- evacuation alarms < in the reactor room and in the second and third floor areas above the. reactor pool.
Radiation Levels: The maximum rediation levels 1 m above the pool surface and at the surface of the concrete shield, when the beam port and' thermal '
column ~ are closed, shall be'less than 50 mrems/hr.
Control Blade Withdrawr,1: the maximum withdrawal rate for.a control blade i 1
shall be 7.5 in./ min. ?The maximum reactivity addition ratt through move-ment of. the regulating blade shall be 0.006% Ak/k sec. Interlocks shall !
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prevent simultaneous withdrawal of more than one control blade and shall d Y prevent withdrawal. of any control blade unless the regulating blade is T( fully inserted. q o
Regulating Blade Worth: The regulating blade shall have a reactivity worth of less .than the effective delayed neutron fraction.
Startup Source Requirement: Ouring reactor startup, a neutron source producing at least 10 neutrons /sec shall be located adjacent to the fuel ,
region.- When readings on the log count rate meter are below 50 counts /sec, 1 an interlock shall prevent withdrawal of any control blade.
Temperature and Void Coefficients: Thetemperatureandgoidcoefficients of reac6v~Eishall- be more neggtive than -2 x 10~5 k/k F and -2 x 10~8 A k/k %. void,nmspectively, at 80 F.
Water Level: The minimum depth of water above the top of the end box of I the core Fiel elements.in the reactor pool shall be 10 f t. i Water Puritv: Corrective action shall be taken promptly if the following ,
Timits TEF'the pool water are not met:
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\ 'I (1) startup channel, background to'10-2% , full power, i .e. ,Taackground to 1 W.
-(2) log-N period channel: 2 x 10 % to 150% full power; i .e.., 0.2 W .to 13 kW (3) Linear safety channels 1 aad 2; 2 x 10~3% to 150% full power; Ne.,
0.2 W to 15 kW 4.5.2 Control Blades '
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..There shall be three control blades, tvch consisting of vertical y aluminum-clad boral blades 10.5 in. wid2 x 40.5 in. long x 0.375 in thick. ,
4.5.3 Regulating Blade t $
m There shall be one regulating blade consisting of 'a vertical stainir.ss- ,
steel blade 10.65 in wide x 40.51r,. long x 0.125 in. thick.
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4.5.4 Blade Position I'ndicators The blade position indicator on tne consolec shall provide an indication of the blade position to within + .02 dn. ' Signal lights shall be proviced for each control blade drive and for the regulating; blade to indicate the upper and lower limits of travel and, in the case of control blades, an armatcre engaged by a magnet.
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