ML18054B482
| ML18054B482 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/02/1990 |
| From: | Smedley R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9003150096 | |
| Download: ML18054B482 (4) | |
Text
consumers Power PDWERINli MICHlliAN'S PRDliRESS General Offices: 1945 West Parnell Road, Jackson,' Ml 49201 * (517) 788-0550 March 2, 1990 Nuclear Regulatory Commission Documen.t Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
. TECHNICAL SPECIFICATION CHANGE.REQUEST - VARIABLE LTOP -
"'-REVISION TO PROPOSED SECTION 3. 1. lh Consumers Power Company's letter dated September 12, 1989 proposed a Technical Specification Change to permit the use of a variable Power Operated Relief Valve (PORV) setpoint during Low Temperature Overpressure Protection (LTOP).
Various proposed changes effecting HPSI operability, the Non Ductility TransitiQn Temperature (NDTT) and initiation of forced circulation were included.
Revision 1 of our September 12, 1989 submittal, dated September 22, 1989, made minor changes to the primary/secondary temperature relationship limitations for initiation of forced circulation.
This revision, however, inadvertently imposed an unnecessary restriction on the initiation of forced circulation by requiring the Shutdown Cooling System (SDCS) to be isolated whenever forced circulation is initiated at PCS temperatures less than 430°F~
As proposed in our September 22, 1989 submittal, forced circulation would be prevented until the Shutdown Cooling System (SDCS) is isolated.
This is not practical since during heatup from cold shutdown the SDCS is used to restrict heatup rate after initiation of forced circulation (System Operating Procedure SOP-1).
The intent of Section 3.1.lh is to specify circumstances when forced circulation may be initiated.while the secondary temperature is
- higher than the primary tempe~ature. This could be the case during a return to power ~fter.a short outage.
The attachment to this letter contains revised Section 3.1.lh~
This revision does not change the intent of Section 3.1.lh as proposed in our September 12 and September 22, 1989 submittals and, therefore, does not 9003150096 900302 PDR ADOCK 05000255 P
PDC OC0290-0262-NL04 A CMS' ENERGY COMPANY
~,of
'1 'l\\
Nuc~ear Regulatory Commission Palisades Plant TSCR Rev to Proposed Sec 3.1.lh March 2, 1990 require review by the Nuclear Safety Services Department (NSSD) or the Plant Review Committee (PRC).
Pswcs ~
Richard W Smedley Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades Attachment OC0290-0262-NL04 2
OC0290-0262-NL04 ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 REVISED PROPOSED SECTION 3.1.lh TECHNICAL SPECIFICATION March 2, 1990 1 Page
3.I PRIMARY COOLANT*SYSTEM (Cont'd) 3.1. I Operable Components - (Gont *' d)
- h.
Forced circulation (starting the first primary coolant pump)
I shall not be initiated unless one of the following conditions is I
met:
I (I)
Primary coolant cold leg temperature is > 430°F.
I (2)
PCS cold leg temperature is ~ 430°F and S/G secondary I
~~mperature is less than PCS cold leg temperature.
I (3) s'hutdown cooling is isolated from the PCS AND PCS cold leg I
temperature is > 2I0°F AND S/G secondary temperture is less I
than I00°F higher than PCS temperature.
I (4)
Shutdown cooling is isolated from the PCS AND PCS cold leg I
temperature is ~ I70°F and ~ 2I0°f AND S/G secondary
/
temperature is less than 20°F higher than PCS cold leg I
temperature.
I (5)
Shutdown cooling is isolated from the PCS AND PCS cold leg I
temperature is ~ I20°F and < I70°F AND S/G secondary I
temperature is less than I00°F higher than PCS cold leg I
temperature.
I i~
The PCS shall not be heated or maintained above 325°F unless a minimum of 375 kW of pressurizer heater capacity is available from both buses ID and IE.
Should heater capacity from either bus ID and IE fall below 375 kW, either restore the inoperable heaters to provide at least 375 kW of heater capacity from both buses ID and IE within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in hot shutdown within the next I2 hours.
Basis When primary coolant boron concentration is being changed, the process must be uniform throughout the primary coolant system volume to prevent stratification of primary coolant at lower boron concentration which could result in a reactivity insertion.
Sufficient mixing of the primary coolant is assured if one shutdown cooling or one primary coolant pump is in operation. (I)
The shutdown cooling pump will circulate the primary system volume in less than 60 minutes when operated at rated capacity.
By imposing a minimum shutdown cooling pump flow rate of 28IO gpm, sufficient' time is provided for the operatoy550 terminate the boron dilution under asymmetric flow conditions.
The pressurizer volume is relatively inactive, therefore will tend to have a boron concentration higher than rest of the primary coolant system during a dilution operation.
Administrative procedures will provide for use of p*ressurizer sprays to maintain a nominal spread between the boron concentration in (2) the pressurizer and the primary system during the addition of boron~
3-Id Amendment No ~7. $$, tl7, 11$,
OC0290-0262-NL04