Revised Proposed Tech Specs Clarifying & Correcting 831212 Amends to Operating Conditions for Reactor Core,Radial Peaking Factor Rept & Special ReptsML20087M407 |
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Mcguire, McGuire ![Duke Energy icon.png](/w/images/7/75/Duke_Energy_icon.png) |
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Issue date: |
03/23/1984 |
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From: |
DUKE POWER CO. |
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Shared Package |
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ML19268E719 |
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References |
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NUDOCS 8403290273 |
Download: ML20087M407 (5) |
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Category:TECHNICAL SPECIFICATIONS
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[Table view] Category:TECHNICAL SPECIFICATIONS & TEST REPORTS
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[Table view] |
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ATTACHMENT 1 2.1 SAFETY LIMITS ,
BASES 2.1.1 REACTOR CORE The restrictions of this Safety Limit prevent overheating of the fuel and possible cladding perforation which would result in the release of fission l
products to the reactor coolant. Overheating of the fuel cladding is prevented by restricting fuel operation to within the nucleate boiling regime where the heat transfer coefficient is .large and the cladding surface temperature is slightly above the coolant saturation temperature.
. Operation above the upper boundary of the nucleate boiling regime could l result in excessive cladding temperatures because of the onset of departure '
from nucleate boiling (DNB) and the resultant sharp reduction in heat transfer coefficient. DNB is not a directly measurable parameter during operation and
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therefore THERMAL POWER and reactor coolant temperature and pressure have been related to DNB through the WRB-1 correlation. The WRB-1 DNB correlation has been developed to predict the DNB flux and the location of DNB for axially uniform and nonuniform heat flux distributions. The local DNB heat flux ratio (DNBR),
defined as the ratio of the heat flux that would cause DNB at a particular core location to the local heat flux, is-indicative of the margin to DNB.
(emto w ou l The minimum value of the DNBR during steady-state operation, norm w-s enatunu) i
! operational transients, and anticipated transients is limited to 1.30 This l l C value corresponds to a 95% probability at a 95% confidence level that DNB will l not occur and is chosen as an appropriate margin to DNB for all operating conditions.
The curves of Figures 2.1-1 and 2.1-2 show the loci of points of THERMAL POWER, Reactor Coolant System pressure and average temperature for which the minimum DNBR is no less than 1.30, or the average enthalpy at the vessel exit g is equal to the enthalpy of saturated liquid. '
% These curves are based on an enthalpy hot channel factor, F N of 1.55 andareferencecosinewithapeakof1.55fraxialpowershapehN,An N allowance is included for an increase in F AH at reduced power based on the expression: .
Fh=1.55[l+0.2(1-P)]
Where,P is the fraction of RATED THERMAL POWER.
These limiting heat flux conditions are higher than those calculated for the range of all control rods fully withdrawn to the maximum allowable control rod insertion assuming the axial power imbalance is within the limits of the (delta I) function of the Overtemperature trip. When the axial power f) im balance is not within the tolerance, the axial power imbalance effect on the Overtemperature Delta T trips will reduce the Setpoints to provide protection consistent with core Safety Limits.
gRADOCKO3290273 840323 p 05000369 PDR McGUIRE - UNITS 1 and 2 8 2-1
'. c,[ ATTACHMENT 2
/
_DN . 27 Inse4 X Fuel rod bowing reduces the value of DNB ratio. Credit is available to partially offset this reduction. This credit comes from generic or plant
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specific design margin. For McGuire Unity 1 and 2, the margin used to partially offset rod bow penalties is 9.1 percent. This margin breaks down as follows:
- 1) Design limit DNBR' l.6% i
- 2) Grid spacing K s 2.9%
- 3) .Themal Diffusion Coefficient 1.2%
- 4) DNBR Multiplier 1.7%
- 5) Pitch Reduction 1.7%
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Fnr Mcnnirdni-t-2, the margin used to partially offset rod bow penalties is 5.9 percent with the remaining 3.2 percent used to trade off against measured flow being as much as 2 percent lower than thermal design flow plus uncertainties. The penalties applied to FN to account for rod bow H
(Figure 3.2-4% nit 1 and-Un+t-2-)- as a function of burnup are consistent with those described in Mr. John F. Stolz's (NRC) letter to T. M. Anderson (Westinghouse) dated April 5,1979 with the difference being due to the amount of margin each unit use to partially offset rod bow penalties.
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. ATTACHMENT 3 ADMINISTRATIVE CONTROLS THIRTY DAY WRITTEN REPORTS (Continued)
- c. Observed inadequacies in the implementation of Administrative or Procedural Controls which threaten to cause reduction of degree of redundancy provided in Reactor Trip Systems or Engineered Safety Features Systems;
- d. Abnormal degradation of systems other than those specified in Specification 6.9.1.10c. above designed to contain radioactive material resulting from the fission process;
- e. An unplanned offsite release of: (1) more than 1 Curie of radioactive material in liquid effluents, (2) more than 150 Curies of noble gas in gaseous effluents, or (3) more than 0.05 Curie of radiciodine in gaseous effluents. The report of an unplanned offsite release of radioactive material shall include the folinwing information:
- 1) A description of the event and equipment involved,
- 2) Cause(s) for the unplanned release,
- 3) Actions taken to. prevent recurrence, and
- 4) Consequences of the unplanned release.
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- f. Measured levels of radioactivity in an environmental sampling medium determined to exceed the reporting level values of Table 3.12-2 when averaged over any calendar quarter sampling period.
RADIAL PEAKING FACTOR LIMIT REPORT
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6.9.1.12 The F xy limit for RATED THERMAL POWERRTP (Fxy ) shall be provided to the Regional Administrator of the NRC Regional Office, with a copy to the Director, Nuclear Reactor Regulation, Attention: Chief, Core Performance Branc'h, U. S. Nuclear Regulatory Commission, Washington, D.C. 20555 for all core planes containing Bank "D" control rods and all unrodded core planes at
- least 60 days prior to cycle initial criticality. In the event that the limit I would be submitted at some other time during core life, it shall be suomitted 60 days prior to the date the limit would become effective unless otherwise exempted by the Commission.
Any information needed to support F xR will be by request from the NRC and need not be included in this report.
trwn c
~SPECIAL REPORTS 6.9.2 Special reports shall be submitted to the Regional Administrator of the NRC Regional Office within the time' period specified for each report.
McGUIRE - UNITS 1 and 2 6-23
l l l NSf8T 2L
. ' ^ ' apr The W(:) function for normal operation shall be provided to the Director, Nuclear Reactor Regulations, Attention Chief of the Core Performance Branch, U. S. Nuclear Regulatory Commission, Washington, uu,r D.C. 20555 at least 60 days prior to cycle initial criticality. In the 1 event that these values would be submittec at some other time during i core life, it will be submitted 60 days prior to the date the values would become effective unless otherwise exempted by the Commission.
Any information needed to support W(z) will be by request from the NRC
_and need not be included in this report.
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ENCLOSURE 1 1
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